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[–] ItGoesOnAnonAnonAnon 0 points 7 points (+7|-0) ago 

Likely similar to the reasons why dogs sniff each others' butts upon introduction. (Goes with @spookybm's response)

Being the dankest, sweatiest part of a body close to the genitals means it's probably the easiest place to find various identifying scents and hormones for animals with strong senses of smell.

But since our noses aren't that strong, it just smells like swamp-ass.

Would also be an unfortunately disgusting explanation for fetishes involving asses.

Science!

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[–] middle_path 1 point 1 point (+2|-1) ago 

Makes sense. Seems like a vestigial part of our bodies, but since our scent over time has lessened, the advantages remain questionable.

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[–] ItGoesOnAnonAnonAnon 0 points 1 point (+1|-0) ago 

Indeed, at this point it's likely one of those things that evolution has backburner'd for the time being, since it doesn't have as much of a noticeable impact on continuation of the species anymore. Not needed enough to improve it, not detrimental enough to remove it.

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[–] Inconceivable2 2 points -2 points (+0|-2) ago 

Our scent has lessened over time? You've never sat on a commuter bus next to a nigger apparently.

Oh, I see, our (humans) scent has decreased. Sub-humans still stink like the filthy animals they are.