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09/25/2007: "Humans not promiscuous by nature"

Sperm cells from the more promiscuous chimpanzee and rhesus macaque species swim much faster and with much greater force than those of humans and gorillas, species where individual females mate primarily with only one male during a reproductive cycle.

[ Are we chaste by nature? The empiric data seems to suggest so. ]

http://www.sciencedaily.com/releases/2007/09/070925090250.htm