All things said, I think my thighs, chest and bald head are much better sweat evaporators/radiators than my glutes, mostly because your glutes have that crack problem, very much like your underarms…
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Really any adaptive explanation that doesn’t involve bipedalism is kind of suspect. Pooping – that’s not some unusual human thing, most other animals do that too.
And of course one always likes to think these things have adaptive explanations and aren’t just the result of being a weird inbred species after a bottleneck just 70000 years ago. 
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Oh, the sweat evaporators are not the glutes, they simply provide the loping gait forward without expending too much energy. It’s a whole network of mutations that sputtered and splorched us to the thinking meat we are now.
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And mules are half-ass.
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sometimes thinking meat:D
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“Ugly sacks of mostly water.”
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