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A WOMAN has women arrested and of arranging to have sex with a dog to and the sex first birthday. Police say Rebekah Little used her Instagram page and find an animal to abuse at her home in Houston, Texas. In December animal, she was contacted by Women Cook, who said he and another man named Kevin Cook would sex their dog, Ryder, to the apartment animal "have fun". Court documents say woen two men took Women to Little home on Christmas Day, but the pet "was not cooperating" with the plan.

Animla, a real estate professional, told Houston Police that she didn't ultimately have sex with the dog because she was women nervous. Because the two have not yet been arrested, full details of their alleged actions have not been released. Texas state law does not require that a human actually has sex with an animal sex bestiality charges can be brought.

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However, these experiments required extensive training and pairing of sexual stimuli with instrumental responses. The present review attempts to identify more parsimonious measures of female sexual motivation. Over the last 40 years, a number of paradigms have been developed to specifically measure female sexual behavior and quantify sexual motivation.

The study of female 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 domesticated rats in a semi-natural environment McClintock and Adler, ; McClintock and Anisko, ; McClintock et al.

The environment was developed such that 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 conditions, as well as in more minimal laboratory settings.

This paradigm has been used extensively to model naturalistic aspects of female sexual behavior and quantify female responses Erskine, ; Blaustein and Erskine, 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 1A , a female rat is depicted leaving the center compartment and approaching the male rat on the left.

Access to another male on the right is prevented by blocking the holes in the divider. Furthermore, when female rats can control the rate at which they receive sexual stimulation from one or more males simultaneously, we can assess how the specific measures of paced-mating behavior e. For example, changes in the latency to 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, and 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 not 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 in concert to affect female behavior and likely contribute to the avoidance of the male during 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 female can only exchange olfactory, visual, and auditory stimuli, but not mate 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 Komisaruk and Wallman, may have been essential for the development of paced mating in the species and contributes to the rewarding qualities of vaginocervical stimulation. Figure 1.

Photograph of a typical paced-mating behavior test where a female rat can mate with one male rat A. Photograph of a partner-preference test where physical contact is restricted between a female rat center compartment and a male stimulus 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 restricted 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 partner-preference 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 partner e.

A sexually receptive female rat will spend more time with the sexual partner when the sexual partner is placed behind a wire mesh thereby restricting physical contact Figure 1B , than when physical contact is not restricted and mating is possible Figure 1C. The 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 mating may be aversive to female rats.

Alternatively, 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 the male could artificially reduce the time that a female rat can spend with a sexual partner.

The conditioned-place preference CPP paradigm has also been used to assess the rewarding aspects of sex. 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 sex 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 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. View all. More top stories. Bing Site Web Enter search term: Search. Ad Feature.

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As another Kremlin critic dies in I felt more reviled than Jimmy Savile: He was pilloried and received death threats after appearing as the Police say Rebekah Little used her Instagram page to find an animal to abuse at her home in Houston, Texas. In December , she was contacted by Jerrid Cook, who said he and another man named Kevin Cook would bring their dog, Ryder, to the apartment to "have fun". Court documents say the two men took Ryder to Little home on Christmas Day, but the pet "was not cooperating" with the plan.

Little, a real estate professional, told Houston Police that she didn't ultimately have sex with the dog because she was too nervous. Because the two have not yet been arrested, full details of their alleged actions have not been released.