And yeah, this is a serious question

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Answers:    Pubic hackle and axillary (armpit) hair are marker of puberty. They are the result of increased production of male hormones (testosterone) by both boys and girls at puberty. There is no other function or purpose for this pelt in today’s humans, although its role contained by sexual attraction and survival of the species for our ancestors is not clear

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no purpose, just let one know when they are going thru puberty

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