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user-inactivated · 3840 days ago · link · · parent · post: What is the evolutionary reason for male facial hair, while women don't have it?
Well, I just did quite a bit of reading and it seems to be, while not fully understood, probably more or less for the reason you would assume -- sexual attraction. Less hair is a sign of youth, which is a sign of potential fertility. There were some good paragraphs here.
r/askscience mostly let me down though.