Wtf were our ancestors doing for our penises to literally evolve into plungers to push out other men's semen that was still hanging out in there
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However. If you're curious, there is some interesting stuff here:
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But it's not that far out when you consider not just our human ancestor, but the evolution of the penis in general in the animal world. Our penis is homologous to the ones of most vertebrates, so we are talking about 600 million years of penis evolution... In constant promiscuity