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Two extremes of female sexual behavior may be controlled by the same brain region In many species, including humans and mice, the fluctuating levels of the hormones progesterone and estrogen determine whether the female is fertile or not. And in the case of mice, whether she s sexually receptive or not. The change in receptivity is striking. Female mice shift from accepting sexual partners to aggressively rejecting them across a cycle of six short days. How can the female reproductive hormones bring about such a radical behavioral change? When searching for an explanation, the team of Susana Lima, a principal investigator at the Champalimaud Centre for the Unknown in Portugal, came across an intriguing discovery. ....
E-Mail IMAGE: Certain neurons in the brains of female mice change their structure across the reproductive cycle, gaining higher complexity during the receptive phase. view more Credit: Champalimaud Centre for the Unknown - Lima Lab (data); Diogo Matias (design). In many species, including humans and mice, the fluctuating levels of the hormones progesterone and estrogen determine whether the female is fertile or not. And in the case of mice, whether she s sexually receptive or not. The change in receptivity is striking. Female mice shift from accepting sexual partners to aggressively rejecting them across a cycle of six short days. How can the female reproductive hormones bring about such a radical behavioural change? ....
Study Finds Scientists debunk theory of why men have to wait for ’round 2′ in bed LISBON, Portugal While a frisky couple may not want their bedroom romp to end, it’s no secret men need a little time to “recharge” after making love. One hormone that has been historically linked to the wait time men require before “round two” is prolactin. A new study may debunk this widely held belief however, as researchers in Portugal find prolactin does not factor into the male post-ejaculatory refractory period. Scientifically speaking, this period starts when the man ejaculates and ends when he regains his sexual capacity again. A team from the Champalimaud Centre for the Unknown says prolactin is involved in hundreds of biological processes within humans. Study authors add even they believed those functions included the male waiting period in between sexual encounters. Their study actually set out to examine this connection further, but instead discovered it ....