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I don't think we know the answer for sure right now, but there are a few guesses.

Copying from Wikipedia.

Various hypotheses concerning the function(s) of pubic hair include:

  • visual indicator of sexual maturity[5]
  • collection of secreted pheromones[6]
  • reduction of external friction during sexual intercourse[7]
  • protection of sensitive pubic area[4]
  • protection of skin on the pubic area from certain infections, rashes, irritations, and acne[citation needed]and other kinds of infections
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14y ago

What else can I help you with?