I have another theory, besides the cat one:
I think that a long, long time ago there used to be all women, no men. Proof? Why do men hae nipples? We have no need for them except as yet another place to sprout hair. Another thing is that what the fuck is a chode? Why is it there? Well, I'll tell you why, it used to be a vagina, but after millions of years of evolution it sealed up leavinvg a small flap of skin.
This also explains gay people, they either haven't evolved as much as other men or something inside them sets them off to act like primitive humans, or should I say primitive huwomans? There of course is no problem with gay people, in fact society is in great debt to them; how would we get haircuts?
A final answer to the question you've been asking: they procreated with gorillas and a few did have penises, just as some men have vaginas and some women have penises today.
Darwin ain't got shit on me.
Its not how good you ski, but how good you look in the lift line that counts.
Jibbin' For Jesus