An evolutionary perspective on penis size

via buzz.google.com and Guardian.co.uk

"The origins of the primate sex drive go back more than 60m years to the late Mesozoic era when the first primate evolved. A lot of sex has taken place since then, and a significant proportion has been motivated by female choice between rival males.1 Female primates can experience multiple orgasms, and it has been theorised that ancestral hominid females sought out males who would sexually satisfy them. Through the mechanism of sexual selection, this will have increased penis size and altered structure.

Today, the average erect gorilla penis is 3cm (1.25 inches) long, the average chimp or bonobo penis comes in at around 8cm and the average human penis stands at around 13cm. Most primates, including chimpanzees, have a penis bone and achieve erections through muscle contraction.2 The human penis has evolved the unusual system of vasocongestion to achieve erection, making the erect organ far more flexible than that of other primate species."

From:
Penis size: An evolutionary perspective | Ask Carole, Evolutionary Agony Aunt | Science | guardian.co.uk

(I couldn't make this stuff up if I tried...)
Carole Jahme shines the cold light of evolutionary psychology on readers' problems. This week: penis size

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• Mon 10 May 2010
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