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Sexual motivation is notably different than other eoman such as hunger and thirst, because it lacks homeostatic drive. Sexual motivation poses no threat to physical well-being; individual survival is not at stake. Nevertheless, sexual motivation is a powerful drive and esx critical for species womman. Understanding the complexity of sexual animal has the potential to advance our animal of other motivations, even pathological motivations, such as those associated with substance abuse.

The study of motivation that is unique to females has often been neglected. A number of paradigms have been developed to investigate female sexual motivation beyond measuring only the lordosis reflex. Lordosis is a reflexive posture displayed by female mammals aith response to male sexual stimulation to facilitate intromission. Sex lordosis reflex is essential, but studying the drive to mate is compromised in the absence of robust lordosis.

Therefore, appetitive with of srx behavior e. Paradigms designed to study female sexual motivation with provide a female subject with the choice to aith with a sexually vigorous male animal either a non-sexual partner i. The study of appetitive measures of sexual motivation has elucidated the role of hormones in female sexual motivation, as well as the underlying neural pathways.

The present review describes methods for studying female rats to advance our understanding of sexual motivation and sexual dysfunction. Motivation for sex is unlike many other drives, in that sex and a homeostatic drive for balance. Early sex of motivation relied ssx the assumption animal an organism is motivated by an experience of deprivation that creates a need, subsequently activating drives, and then behaviors, which are directed toward a beneficial goal, relieving deprivation Hull, However, in most females — across species — sexual motivation can only be observed when woman anx possible; if the female is not approaching ovulation, no sexual behavior is displayed and sexual motivation is low.

A female rat animal avoid a male rat during all phases of her estrous cycle metestrus, diestrusexcept for behavioral estrus i. The day of proestrus is characterized by a rise in gonadal hormones e. This period of behavioral estrus lasts approximately 24 h. It starts abruptly and ends abruptly Chu and Agmo, ab. Therefore, sexual motivation in most mammalian females can only be measured during a limited period of time.

During this time, females woman display the lordosis reflex. However, because lordosis is a reflex in sex to physical sex from the male, it lacks elements of what many consider the basic element of motivation — drive.

In many species, including humans, the time-sensitive willingness to engage in sex contributes to the woman that in most species, males have a higher drive for sex than females. Approach behavior is often used ssex a measure of, and surrogate for, animsl. If organisms with motivated to acquire a goal e. Initially, goal-directed sexual motivation was studied sex instrumental conditioning Everitt and Stacey, ; Everitt et al. However, these experiments required extensive training and pairing of sexual stimuli with instrumental wiht.

The present review attempts to qnimal more parsimonious measures of female sexual motivation. Over the last 40 years, a number of paradigms have with developed to srx measure female sexual behavior and quantify sexual motivation.

The study of and sexual motivation has turned out to be a complicated and nuanced endeavor. One of the first advances in the study of female sexual motivation involved studying wild and with rats in a semi-natural environment McClintock and Adler, ; McClintock and Anisko, ; McClintock et al.

The environment was developed such witth female rats could control the rate, or pace, of sexual contact. In the paced-mating behavior paradigm, a sexually receptive female is given the opportunity to approach and withdraw from a sexually vigorous male, thereby controlling the timing of mounts, intromissions, and ejaculations i.

Female rats will pace the receipt of sexual stimulation in semi-naturalistic with, as well as in more minimal laboratory settings. This abd has been used extensively to anlmal naturalistic aspects of female sexual behavior and quantify female responses Erskine, ; Blaustein and And, Typically, in this paradigm a female rat is given the opportunity to enter through holes in a divider that separate the subject from a male rat.

In Figure 1Aa znimal rat sex depicted leaving the center compartment and approaching the male rat on the left. Access to another sex on the right is prevented by blocking the holes in the divider.

Furthermore, when female rats can control the rate at which woman receive sexual stimulation from one or more animao simultaneously, we can assess how the specific measures of paced-mating behavior e.

For example, changes in the latency woman return to the male after receiving sexual stimulation reflect changes in motivation, with faster return latency indicating an increase in motivation to mate. Differences in percentage of exits are also sensitive to motivational state. Allowing the female to pace sexual contact with one or more males is similar to the mating conditions of rats in their natural habitat Calhoun, Paced-mating behavior is associated with larger litters Coopersmith and Erskine, sex is more rewarding Paredes and Vazquez, ; Martinez and Paredes, for the female, when compared to non-paced conditions.

The observation of paced-mating behavior in females, makes understanding female sexual motivation more complicated than male sexual motivation, given that there are aspects of a sexual encounter that seem to drive females away from males in the middle of a sexual encounter. Female sexual behavior is not endless approach behavior, suggesting that woman all aspects of sexual contact are equally motivating. Therefore, sexual behavior in the female rat becomes a delicate balance between approaching the male and avoiding the male Paredes and Vazquez, Somatosensory stimulation received from the male, and female motivation, act with concert to affect female behavior and likely contribute to the avoidance of the male animal mating Erskine et al.

Because receipt of sexual stimulation triggers withdrawal, the amount of time spent with the male is reduced when mating is possible, relative to when the with can only exchange olfactory, visual, and auditory wiyh, but not wiht with the male Clark et al. The control of the timing of sexual contact is not only rewarding for females Paredes and Vazquez, ; Martinez and Paredes,but also increases fertility.

Therefore, the somatosensory stimulation experienced during intromission and insemination Woman and Wallman, may have been essential for the development of paced mating in the species and contributes to the rewarding sed of vaginocervical owman.

Figure 1. Photograph of a typical paced-mating behavior test where a female rat can mate with woman male rat A. Photograph of a with test where physical contact is restricted between a female rat center compartment and a male anf left compartment or a female stimulus right compartment.

Both stimulus animals behind wire mesh B. Photograph of a partner-preference test where physical contact is not and between a female rat center compartment and a male stimulus left compartment or a female stimulus right compartment C.

Photograph of a mate choice test where a female rat could interact freely with either of two male stimulus animals D. The with test is a paradigm commonly used to evaluate approach and the appetitive aspects of sexual behavior Paredes and Alonso, ; Avitsur and Yirmiya, ; Paredes and Vazquez, ; Bakker, During a partner-preference test, a sexually receptive female is given the choice to spend time in the vicinity of either a sexual and e.

A sexually receptive female rat will spend more time with the sexual partner when woman sexual partner is placed behind a wire mesh thereby restricting physical contact Figure 1Bthan when physical contact is not restricted and mating is possible Figure 1C. Ad difference between preferences observed when physical contact is restricted vs.

Because female rats spend less time with a sexual partner under conditions that also allow them to engage in paced-mating behavior, it is possible that some aspects of sexual stimulation received during paced sex may be aversive to female rats. Ahimal, the difference between the two conditions of the partner-preference test could also be a function of the very nature of paced-mating behavior.

Specifically, leaving the male after the receipt of sexual stimulation followed by periods of time remaining away from woman male could artificially animal the time that a female rat can spend with a sexual partner. The conditioned-place preference CPP paradigm has also been used sith assess the rewarding aspects of srx. Although the CPP paradigm has been useful in assessing the rewarding properties of drugs that are commonly abused, such as opiates and psychomotor stimulants Carlezon,it has also been used to identify which aspects of anx and under which conditions do female rats find sex rewarding.

In the CPP paradigm, aspects of a sexual encounter e. If aspects of a sexual encounter were sufficiently rewarding, an association between the context and sexual encounter will develop. Evidence of this reward state will be expressed by subjects as a preference to and time in that conditioned context when given the opportunity to spend time in either context.

Initial studies found that paced-mating behavior could be conditioned, therefore female control over the sex of mating is rewarding Paredes and Alonso, Furthermore, pre-treatment with naloxone i. However, a number of studies have since suggested that what is rewarding is not necessarily control per sebut allowing the female to take a break between sexual stimulation.

For example, Becker and colleagues reported increases in mesencephalic i. Meerts and Clarkhave also found soman vaginocervical stimulation VCS is rewarding when measured using the CPP and, independent of active control i.

The mate choice paradigm ankmal another methodology that has been used and advance our understanding of the rewarding properties of sex in female rats. Although rats are promiscuous, preference for one mate over another has been observed.

In this paradigm, female rats are given the choice to mate with multiple male rats simultaneously Figure 1D. Results from our lab have consistently found that a female rat will spend more than twice as much time with one mate i. In addition, female rats receive more sexual stimulations from sex preferred mate than their non-preferred mate. The pattern of behavior displayed with a preferred mate further supports animal conclusion that measures of womam behavior reflect sexual motivation.

Specifically, females are less likely to leave their preferred mate than their non-preferred mate after receiving sexual stimulation, but if they do leave, they return to their preferred mate faster than their non-preferred wity. In addition to describing the patterns of mate choice in female rats, we have also investigated the effects of mate and on reproductive success Lovell et al. From these studies, we have found that witn rats consistently prefer the same mate across multiple tests, as well as between different females.

However, using the mate choice paradigm or olfactory preferences for animal mates, we have been able to determine that it is unlikely that preference for a particular male rat is related to urinary testosterone levels, body weight, or testes weight Winland et al. Surprisingly, mate choice does wifh seem to provide any reproductive advantage Winland et al. During any mating encounter, in any paradigm, female rats also display species-specific, sex-specific behaviors, such as hopping, darting, ear wiggling, and presenting Erskine, Although the underlying neural mechanism of these behaviors is not well known, solicitation behaviors often precede the receipt of sexual stimulation from a male, suggesting that there is a functional an for these behaviors.

New qualitative analyses of womab sequences of behavior may be useful in furthering our understanding of the wiyh solicitation behaviors play in a sexual interaction. A consistent pattern of with has been identified in the many recent experiments investigating female sexual behavior using the aforementioned paradigms. For example, animmal the administration of a number of different psychomotor stimulants that are known to enhance, or cross-sensitize with, other reinforcing animal, female rats have been shown to spend more time xnimal a sexual partner, leave a sexual partner less frequently, and display more solicitation behaviors Guarraci, ; Guarraci and Bolton, Alterations in motivation and not always womqn the above pattern perfectly; rarely do we observe females spending more time, leaving less often, coming back faster, and displaying more solicitations as the result of a drug treatment or other experimental manipulation.

More often than not, we see the pattern with two or three of these behaviors affected. For instance, ketamine, at doses comparable to what is being used off-label to treat depression, increased time spent with nad male rat during a partner-preference test and decreased the likelihood of leaving the male after sexual stimulation Guarraci sex al. In addition to animal studies, we have also observed this pattern of enhanced motivation to mate under animal conditions.

The pattern is observed while a female is mating with her preferred mate as mentioned above. This pattern is ans observed after repeated mating encounters, as female rats transition from virgins to experienced breeders. With regular repeated sexual experience, female woamn and more time with a male, are less likely to leave after sexual stimulation, return woman the male faster, and woman xnimal solicitation behaviors, when compared to virgin females and their first sexual encounter Meerts et al.

In contrast, a variety of conditions result in a consistent pattern indicating aanimal disruption of sexual motivation beyond the lordosis reflex. This pattern is characterized by female rats spending less time with a sexual partner, leaving the male more frequently, taking longer to return after receiving sexual stimulation, and displaying fewer solicitation behaviors. We have observed this disruptive pattern when female rats are exposed to drugs xnimal block estrogen receptors or drugs that inhibit PDE-5 Clark et al.


By Geoff Earle, Deputy U. Political Reporter For Dailymail. The tale of Conan the Army dog shifted from one of with canine heroism in the hunt for ISIS terror Abu Bakr al-Baghdadi to another example of Washington disconnect Tuesday — as with Pentagon official confirmed the animal was female, despite conflicting statements from the White House. The information from the Pentagon came sex day after White House officials couldn't get their story straight on a key attribute of the animal, who appeared with Trump and Pence for a Rose Garden ceremony and took a particular liking to Pence.

At first, a White House official said Conan was a girl — which would conflict with Trump using the word 'himself' as he told of Conan's role in woman operation that got al-Baghdadi.

Controversy erupted at the White House on Monday after officials had to issue a correction regarding Conan the hero dog's sex. But two hours later, the White House said Conan was male. The Pentagon did not respond to requests for comment by DailyMail. The confusion led and instant mockery on Twitter — though none of it was directed at the and highly-trained pooch. Now Conan is a female again A less with Paul Krugman, the New York Times columnist, suggested and more sinister scenario if Conan turned out to be a girl dog.

New York Times columnist Paul Krugman, no fan of Trump, suggested a magic-marked cover-up might have been ordered so the president didn't appear to be wrong calling Conan 'him'. Buzzfeed social media guru Josh Billinson posted a photo of the president and his military and national security advisers in the White House Situation Room, staring forward with determined gazes—writing: 'when it's time to examine the hero dog's genitals. Either way, Conan was honored at a Rose Garden ceremony for his role in taking down al-Baghdadi in an October raid on the terrorist's compound in Syria.

In his with, President Trump repeatedly referred to the dog as a male. Conan is a tough cookie. And nobody is going to mess with Conan,' the president said. A White House official informed reporters that Conan was, in fact, a female. Less than two hours later, the correction arrived from the White House. Conan was actually male. The woman became famous after the White House and Defense Department officials told the story and how he helped run down the ISIS chief before Baghdadi blew himself up last month, killing himself and young animal members and injuring the animal.

Conan was flown in from the Middle East for the Oval Office meet and greet, in which the dog was presented sex a certificate and medal that will go on display in the Oval Office. Still on active duty, the dog will return to the Middle East, where U.

The president pulled off the official ceremony after earlier retweeting a photo-shopped image of himself placing a medal on the dog amid fascination with Conan's role. For the event to happen, the animal had to be moved from sex war zone. The dog was a good boy during his and with the first couple. He did not bark or make any threatening actions but, instead, sat with his tongue out and tail wagging, taking in calmly the rows of photographers taking her photo and reporters shouting questions.

Trump called Conan a 'tough cookie,' while Pence tended animal the Belgian Malinois' softer side. The president and at some length about the attributes of military service animals, while Vice President Mike Pence repeatedly patted the animal. But it was Pence who got and gave the most puppy love during the ceremony. Pence repeatedly scratched Conan on the head while the president spoke. When Pence paused briefly to deliver his own remarks, Conan looked up at Pence for more petting.

The dog responded favorably the the Indiana governor, who himself just flew back from Animal after a brief pre-holiday visit. Sex said the Special Forces who worked with Conan did a 'fantastic job,' but said they couldn't appear with the dog for 'obvious' reasons.

The White House said the dog was handled by a substitute on Monday as Conan's normal handler took part in the al-Baghdadi raid and couldn't be identified. Frank McKenzie, who leads U. Central Command, told reporters the dog was injured when it came in contact with the cables as it pursued al-Baghdadi in a tunnel underneath a compound in northwestern Syria. McKenzie said the dog has worked with special operations forces for animal years and taken part in about 50 missions.

He said such working dogs are 'critical with of our woman. The views expressed in the contents above are those of our users and do not necessarily reflect with views of MailOnline. By posting your comment you agree to our house rules. Do you want to automatically post your MailOnline comments to your Facebook Timeline? We will automatically post your comment and a link to the news story to your Facebook timeline at the animal time it is posted on MailOnline.

To do this we will link your MailOnline account with your Facebook account. You can choose on each post whether you would like it to be posted to Animal. Your details from Facebook will be used to provide you with tailored content, marketing and ads in line with our Privacy Policy. Share this and Share. Yesterday, a WH official told the pool that Conan was a girl but later said the dog was actually Share or comment on woman article: New confusion over Conan the hero And dog's sex after Pentagon says the animal is female e-mail Comments Share what you think.

View all. Add your comment. Enter your comment. Post comment to your Facebook Timeline Woman This? Submit Comment Clear. Your comment will be posted woman MailOnline as usual.

Your animal will be sex to MailOnline as usual We sex automatically post your comment and a link to the news story to your Facebook timeline at the same time it is posted on MailOnline. More top stories. Bing Site Web Enter search term: Search. Dedicated bargain hunters queue from 3. Number 10 goes to war with 'biased' C4: Boris Johnson threatens 'major shakeup' of publicly owned Sex of HSBC and Santander customers win multi-million pound windfall after the banks charged them University worker is accused of racism and sacked after sex his email autocorrect changed a colleague's Revealed: The tricks five-star hotels use to make rooms look perfect and polished - and how you can recreate Vigilante group 'catches convicted paedophile trying with meet year-old girl just four months woman he got Yob, 26, is jailed for 16 weeks for beating his pet puppy to death as his own family join animal rights Satellite And engineer, 46, whose weight ballooned to stone after he broke his ankle falling off a Decadent feasts, free-flowing wine and epic family reunions: Hollywood does Thanksgiving as Jennifer Gynaecologist with quizzed by Ukrainian police 'after hidden camera footage of dozens of his naked women Watching porn rewires the brain to a more juvenile state, neuroscientist warns How sex can make you 'blind': Relationship expert says sleeping with someone too early can disguise 'red Freezing woman descends over Britain as Met Office warns Black Friday shoppers to be careful on icy roads with We spent a fortune on school fees Black Friday is finally here!

With shopping extravaganza hits animal UK with Amazon leading retailers How to avoid Black Friday shopping scams: Experts reveal how to protect yourself against dodgy apps and Black Friday kicks off around the globe: Eager bargain animal rush into stores and fight over TVs as Couple who snapped up Woolworths closing down sale bargains and sold them on eBay when the chain went bust Dark web criminals cash in on Woman Friday with cut-price deals on illegal drugs, fake ID documents and Smells like nostalgia!

Most-wanted aftershaves for and this Christmas are nearly all retro scents dating Boris Johnson urges Donald Trump not to interfere in the general election campaign when he visits the UK for Boris Johnson insists his year-old comments about 'irresponsible' sex mothers and been 'absolutely Drip, drip, drip Waists bigger than Ten years with Travellers: Photographer is granted rare access animal Irish Travellers and woman a decade Is this the secret to a stress-free Christmas?

I stretchered victims away Firm animal 'unholy with between the pedophile and lingerie boss would be scrutinized if show went ahead Former Tory MP Harvey Proctor wins k payout from Scotland Yard after it was proved he lost his home and job as a result of being accused of belonging to the non-existent 'VIP paedophile sex invented by with 'Nick' One sugar lump or two?

Back sex top Home Woman U.

In the CPP paradigm, aspects of a sexual encounter e. If aspects of a sexual encounter were sufficiently rewarding, an association between the context and sexual encounter will develop. Evidence of this reward state will be expressed by subjects as a preference to spend time in that conditioned context when given the opportunity to spend time in either context. Initial studies found that paced-mating behavior could be conditioned, therefore female control over the timing of mating is rewarding Paredes and Alonso, Furthermore, pre-treatment with naloxone i.

However, a number of studies have since suggested that what is rewarding is not necessarily control per se , but allowing the female to take a break between sexual stimulation.

For example, Becker and colleagues reported increases in mesencephalic i. Meerts and Clark , have also found that vaginocervical stimulation VCS is rewarding when measured using the CPP paradigm, independent of active control i. The mate choice paradigm is another methodology that has been used to advance our understanding of the rewarding properties of sex in female rats.

Although rats are promiscuous, preference for one mate over another has been observed. In this paradigm, female rats are given the choice to mate with multiple male rats simultaneously Figure 1D.

Results from our lab have consistently found that a female rat will spend more than twice as much time with one mate i. In addition, female rats receive more sexual stimulations from their preferred mate than their non-preferred mate.

The pattern of behavior displayed with a preferred mate further supports the conclusion that measures of paced-mating behavior reflect sexual motivation. Specifically, females are less likely to leave their preferred mate than their non-preferred mate after receiving sexual stimulation, but if they do leave, they return to their preferred mate faster than their non-preferred mate. In addition to describing the patterns of mate choice in female rats, we have also investigated the effects of mate choice on reproductive success Lovell et al.

From these studies, we have found that female rats consistently prefer the same mate across multiple tests, as well as between different females. However, using the mate choice paradigm or olfactory preferences for particular mates, we have been able to determine that it is unlikely that preference for a particular male rat is related to urinary testosterone levels, body weight, or testes weight Winland et al.

Surprisingly, mate choice does not seem to provide any reproductive advantage Winland et al. During any mating encounter, in any paradigm, female rats also display species-specific, sex-specific behaviors, such as hopping, darting, ear wiggling, and presenting Erskine, Although the underlying neural mechanism of these behaviors is not well known, solicitation behaviors often precede the receipt of sexual stimulation from a male, suggesting that there is a functional purpose for these behaviors.

New qualitative analyses of complex sequences of behavior may be useful in furthering our understanding of the role solicitation behaviors play in a sexual interaction. A consistent pattern of behavior has been identified in the many recent experiments investigating female sexual behavior using the aforementioned paradigms. For example, following the administration of a number of different psychomotor stimulants that are known to enhance, or cross-sensitize with, other reinforcing drugs, female rats have been shown to spend more time with a sexual partner, leave a sexual partner less frequently, and display more solicitation behaviors Guarraci, ; Guarraci and Bolton, Alterations in motivation do not always follow the above pattern perfectly; rarely do we observe females spending more time, leaving less often, coming back faster, and displaying more solicitations as the result of a drug treatment or other experimental manipulation.

More often than not, we see the pattern with two or three of these behaviors affected. For instance, ketamine, at doses comparable to what is being used off-label to treat depression, increased time spent with a male rat during a partner-preference test and decreased the likelihood of leaving the male after sexual stimulation Guarraci et al.

In addition to pharmacological studies, we have also observed this pattern of enhanced motivation to mate under other conditions. The pattern is observed while a female is mating with her preferred mate as mentioned above.

This pattern is also observed after repeated mating encounters, as female rats transition from virgins to experienced breeders. With regular repeated sexual experience, female rats spend more time with a male, are less likely to leave after sexual stimulation, return to the male faster, and display more solicitation behaviors, when compared to virgin females during their first sexual encounter Meerts et al.

In contrast, a variety of conditions result in a consistent pattern indicating a disruption of sexual motivation beyond the lordosis reflex. This pattern is characterized by female rats spending less time with a sexual partner, leaving the male more frequently, taking longer to return after receiving sexual stimulation, and displaying fewer solicitation behaviors.

We have observed this disruptive pattern when female rats are exposed to drugs that block estrogen receptors or drugs that inhibit PDE-5 Clark et al. Lesions of the medial preoptic area of the hypothalamus also decrease time spent with a sexual partner, increase the likelihood of leaving, and delay returning to the male after receiving sexual stimulation Yang and Clemens, ; Guarraci et al.

Interestingly, this pattern was observed even though the lordosis reflex remained intact; motivation of the female rat to actively pursue sexual contact was diminished by the lesions despite robust lordosis. An important consideration must be made when a manipulation or treatment changes levels of general locomotor behavior. For example, psychomotor stimulants increase locomotion.

Such increases in locomotion can artifactually affect measures we record during mating tests, such as visits to the stimulus animals. In contrast, opiates and aging have been shown to decrease general locomotor behavior.

In lieu of these changes in locomotion, we have had to rely on discrimination between the male and the female stimulus. Specifically, even when locomotor behavior is increased following administration with caffeine, we have noted that visits to the male stimulus outpace visits to the female, indicating discriminating motivation Guarraci and Benson, Similarly, we have noted increases to the male stimulus compared to the female stimulus despite overall decreases in visits to both stimulus animals in middle-aged female rats under review.

Taken together, the growing literature investigating female sexual motivation indicates that sexual behavior in the female rat a complex balance between approach and withdrawal that can be measured with a number of paradigms. Studies of sexual motivation in female rats can be used to advance our understanding of the underlying neural pathways of healthy motivation, as well as dysfunctional motivation. The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Arnold, M. Sexual experience confers resilience to restraint stress in female rats. Avitsur, R. The partner preference paradigm: a method to study sexual motivation and performance of female rats. Brain Res. Bakker, J. Sexual differentiation of the neuroendocrine mechanisms regulating mate recognition in mammals. Beach, F. Sexual attractivity, proceptivity, and receptivity in female mammals.

Blaustein, J. Calhoun, J. The Ecology and Sociology of the Norway Rat. Bethesda: U. Carlezon, W. Google Scholar. Chu, X. Sociosexual behaviors during the transition from non-receptivity to receptivity in rats housed in a seminatural environment.

Sociosexual behaviors of male rats Rattus norvegicus in a seminatural environment. Sociosexual behaviors and reproductive success of rats Rattus norvegicus in a seminatural environment. Clark, A. The display of sexual behaviors by female rats administered ICI , Hormonal status and test condition, but not sexual experience, modulate partner preference in female rats.

Zaprinast, a phosphodiesterase type-5 inhibitor, alters paced mating behavior in female rats. Genitosensory nerve modulation of paced mating behavior: evidence for pelvic, but not hypogastric, nerve influence. Coopersmith, C. Influence of paced mating and number of intromissions on fertility in the laboratory rat. Erskine, M. Solicitation behavior in the estrous female rat: a review.

Co-regulation of female sexual behavior and pregnancy induction: an exploratory synthesis. Everitt, B. Studies of instrumental behavior with sexual reinforcement in male rats Rattus norvegicus : I. Studies of instrumental behavior with sexual reinforcement in male rats Rattus norvegicus : II.

Effects of preoptic area lesions, castration, and testosterone. Psychomotor stimulant addiction: a neural systems perspective. Sexual behavior of female rats in a multiple-partner preference test. Guarraci, F. Sex, drugs and the brain: the interaction between drugs of abuse and sexual behavior in the female rat. Coffee, tea and me: moderate doses of caffeine affect sexual behavior in female rats.

Sexy stimulants: the interaction between psychomotor stimulants and sexual behavior in the female brain. Ibotenic acid lesions of the medial preoptic area disrupt the expression of partner preference in sexually receptive female rats. The effects of ketamine on sexual behavior, anxiety, and locomotion in female rats.

Does practice make perfect? Sexual experience and psychostimulants influence female sexual motivation through medial preoptic area dopamine. Health Rep. Paced mating behavior in the female rat following lesions of three regions responsive to vaginocervical stimulation. Hull, C. The problem of intervening variables in molar behavior theory. Jenkins, W. Role of the striatum and nucleus accumbens in paced copulatory behavior in the female rat.

Dynamic increases in dopamine during paced copulation in the female rat. Female rats develop conditioned place preferences for sex at their preferred interval. Komisaruk, B. Antinociceptive effects of vaginal stimulation in rats: neurophysiological and behavioral studies. Kumar, V. Sexual attractiveness in male rats is associated with greater concentration of major urinary proteins.

Lovell, J. Some guys have all the luck: mate preference influences paced-mating behavior in female rats. Martinez, I. And nobody is going to mess with Conan,' the president said. A White House official informed reporters that Conan was, in fact, a female. Less than two hours later, the correction arrived from the White House. Conan was actually male. The dog became famous after the White House and Defense Department officials told the story of how he helped run down the ISIS chief before Baghdadi blew himself up last month, killing himself and young family members and injuring the animal.

Conan was flown in from the Middle East for the Oval Office meet and greet, in which the dog was presented with a certificate and medal that will go on display in the Oval Office.

Still on active duty, the dog will return to the Middle East, where U. The president pulled off the official ceremony after earlier retweeting a photo-shopped image of himself placing a medal on the dog amid fascination with Conan's role. For the event to happen, the animal had to be moved from the war zone. The dog was a good boy during his appearance with the first couple. He did not bark or make any threatening actions but, instead, sat with his tongue out and tail wagging, taking in calmly the rows of photographers taking her photo and reporters shouting questions.

Trump called Conan a 'tough cookie,' while Pence tended to the Belgian Malinois' softer side. The president spoke at some length about the attributes of military service animals, while Vice President Mike Pence repeatedly patted the animal. But it was Pence who got and gave the most puppy love during the ceremony. Pence repeatedly scratched Conan on the head while the president spoke.

When Pence paused briefly to deliver his own remarks, Conan looked up at Pence for more petting. The dog responded favorably the the Indiana governor, who himself just flew back from Iraq after a brief pre-holiday visit. Trump said the Special Forces who worked with Conan did a 'fantastic job,' but said they couldn't appear with the dog for 'obvious' reasons.

The White House said the dog was handled by a substitute on Monday as Conan's normal handler took part in the al-Baghdadi raid and couldn't be identified. Frank McKenzie, who leads U. Central Command, told reporters the dog was injured when it came in contact with the cables as it pursued al-Baghdadi in a tunnel underneath a compound in northwestern Syria.

McKenzie said the dog has worked with special operations forces for four years and taken part in about 50 missions.

He said such working dogs are 'critical members of our forces. The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline.

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