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I too have wondered this before. Until I started reading this post though, I really hadn't brainstormed more than a moments worth to come up with anything. My feeling on the matter is...
long ago when man walked around naked or in those little genital/ass flaps, I imagine flies and other such bugs (who are of course more than attracted to the smell of ass, especially (I imagine) cave man ass. So perhaps ass hairs provide the same function as nose hairs, to keep pests away?
(Sorry if this has already been said or something, I haven't finished reading the thread)
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