Zits - Why?

Everything physical comes from cavemen.

That's because there were thousands and thousands of generations of them, versus, up to now, only about 400 generations of civilized homo sapiens. Our bodies are the result of breeding and adapting, breeding and adapting, over tens of thousands of years.

so...

Why do we have zits on our asses and faces? They serve as a signal, during puberty, that we are ready to reproduce. Sorry, guys.

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and...

Why do blacks get fewer zits than Anglos? Because in Africa the temps are hotter than in Europe, so cavemen had less body hair and less of a need for some sort of signal to the other sex that they were ready to reproduce. Their tits and dicks were waving for all to see.