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 Wysłany: Pią 11:35, 30 Mar 2007 Temat postu: News:enlarge penis |
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Penis is a competitive beast
A marvel of evolutionary design?
Scientists believe the shape of the penis may have evolved to help men remove the semen of love rivals during sex.
Tests led a team of US researchers, headed by Professor Gordon Gallup, to conclude that the penis acts as a "semen displacement device" and its shape has evolved in part to displace another man's semen.
The team from the State University of New York believe the thrust of the penis during sex may help to clear a woman's reproductive system of a previous lover's semen.
They tested their theory in experiments using latex phalluses, an artificial vagina and a mixture of starch and water.
The human penis may enable males to substitute their semen for the semen of their competitors
Professor Gordon Gallup
New Scientist magazine reports they found the coronal ridge of the penis, found where the glans, or head, meets the shaft, could scoop out more than 90% of the cornstarch mixture with just one thrust.
A phallus with no coronal ridge only managed to remove 35%.
They found the depth of thrusting was also important. A three-quarter thrust was found to clear out less than 40% of the viscous mixture.
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[link widoczny dla zalogowanych] bay!!! 
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