There must be genes for everything!

See:

http://motherboard.tv/2011/9/22/evolution-explains-why-we-still-have-butt-hair–2

Article reads:  If I’d been born in, say, the African savannah in pre-sunblock times, I’d have been dead from sunburn before I ever got old enough to have kids, which means my pale genes would have been dead in their tracks. My ass hair doesn’t present the same issues: it’s not inherently detrimental to my survival, which means it’s not preventing me from living long enough to make little versions of me. Therefore, the butt hair genes live on.

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