The theory goes back centuries, when women had sx with several partners, to increase their chances of getting pregnant.
centuries ago, experts believe that the pnis has evolved into a " tool" , with a ridge to remove the semen of a rival.
Professor Gordon Gallup of the State University of New York led a team of scientists studying the anatomy of the human pnis in 2003
The theory behind this is pretty simple- men basically want to be sure. make sure they are the ones to maintain their lineage and win the pregnancy.
They found that the thrust of the pnis- and the ridge that separates the head from the shaft- can actually help clear a woman' s v@gina and the reproductive system of her previous lover' s semen.
This means that a new partner can eliminate any competition and replace it with one' s own sperm.
They tested their theory in the lab, with a rubber pnis and a sample v@gina.
By mixing starch and water together, they have found that the ridge around the tip of a man' s pnis can extract more than 90% of the " sperm" substitute, in a single push.
Professor Gallup explains: " We hypothesize that due to paternity competition, human males have evolved uniquely configured pnises that move sperm out of the v@gina.
" Human penises may therefore allow males to substitute their sperm for their competitors' sperm.
He said they have found evidence that couples are more likely to have sx if the wife is suspected of infidelity, or if a couple has broken up.
This may be due to a subconscious desire to remove all traces of another man' s sperm from his partner, he says. Professor Gallup' s colleague, Rebecca Burch, added: " A longer pnis would not only be an advantage in bringing semen into the less accessible part of the v@gina, but by also filling and widening it.
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