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

Evolutionary advantage is a misnomer here. Not everything that's 'evolved' is necessarily an advantage. As long as the characteristic, in this case sweaty butt, isn't such a disadvantage that it results in the species being eaten by dinosaurs faster than it can reproduce. There are lots of things about the body that are inconvenient but not fatally so.