18 Μαρ 2011

How the Penis Lost Its Spikes


By Zoë Corbyn
Sex would be a very different proposition for humans if -- like some animals including chimpanzees, macaques and mice -- men had penises studded with small, hard spines.
Now researchers at Stanford University in California have found a molecular mechanism for how the human penis could have evolved to be so distinctly spine-free. [More]

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