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The ridge that separates the head from the shaft - could help clear a woman's vagina Free fuck La city reproductive system of a lover's sperm. Photo: Pixabay Have you ever wondered why your manhood is deed the way it is? Not going into details about the length and girth, the head of the penis, if you notice, actually resembles a mushroom.

With a ridge to remove semen of love rivals so that it ensured that the prospective suitor was the Need to get laid Olympia Washington one who could get the girl pregnant.

According to Professor Gordon Gallup from the State University of New York who led a team of scientists to investigate the anatomy of the human penis and its use, the thrust of the penis - and the ridge that separates the head from the shaft - could help clear a woman's vagina and reproductive system of a lover's sperm.

They tested their theory in the lab - with latex penises and model vaginas.

Speaking to BBC, Prof Gallup said that they theorised that as a consequence of competition for paternity, human males evolved uniquely configured penises that function to displace semen from the vagina left Swingers montgomery.

wife swap personals, swinger clubs other males. He said they found evidence that couples tend to have more energetic sex if the woman has been suspected of cheating, or if a couple has been apart.

It could, he said, be down to a sub-conscious desire to rid his partner of any trace of another man's semen. According to their study, a longer penis would not only have been an advantage for leaving semen in a less accessible part of the vagina, but by filling and expanding the vagina it also would aid and abet the displacement of semen left by other males as a means of maximising the Xxx Brownsville sex fuck of paternity.

The study was published in the Journal of Evolutionary Psychology.