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I'm not sure there's a "purpose" for it. It might be more appropriate to ask "why are humans so un-hairy, relatively speaking"? The lack of hair in most places is really one of humanity's most distinctive features, from the point of view of a hypothetical extraterrestrial observer. This trait is shared by only a few other mammals, most of which are aquatic.

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13y ago

What else can I help you with?