why aren’t the bottom of boobs as hairy as armpits? different sorta friction? historically smaller breasts?
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on that note why is there often particular growth on finger/toe segments
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My bet is its a deterrent to insect bites. Trade off between utility of Apocrine, Eccrine, Sebaceous glands, (and density) to feed skin microbiome all seem to correlate with disease vectors. Fun: https://www.abc.net.au/science/articles/2011/12/14/3391040.htm …
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