I know why we have hair

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I was sitting up last night thinking about stuff and realized why we have hair.

We have head and body hair in the areas where our respective genders gown it because those are the areas where we lose heat the most. We have armpit and pubic hair to act as tassels to absorb our pheromones and waft them into the air to attract nearby and potential mates.

u r right about scent

That's the reason we have kept it indeed; we had full fur a few thousand years ago, before we started wearing clothes