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January 9, 2014 04:00 pm PST
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/fIzIpKoX6HY/story01.htm
Human penis-shape and spermcompetition
In The human penis as a semen displacement device, a 2003 paper published in Evolution and Human Behavior, a group of SUNY Albany psych researchers investigated the shape of the human penis to discover whether it could aid in "sperm competition," driving sperm out of the vagina prior to its own deposit -- something already observed in damselflies.     |
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/fIzIpKoX6HY/story01.htm
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