Why do we still grow underarm hair?

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sarah drury

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Why do we still grow underarm hair?
« on: 04/12/2009 11:30:04 »
sarah drury asked the Naked Scientists:
Please could you tell me why we still grow hair under our arms?


What do you think?


Offline EatsRainbows

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Why do we still grow underarm hair?
« Reply #1 on: 04/12/2009 12:15:48 »
I've heard it reduces friction between the arm and body during rigorous activity, being proposed to be a biological advantage. Other idea I've heard is that it collects pheromones but as far as i'm aware its debatable as to whether or not humans respond to such chemicals, though perhaps our ancestors could have done, thereby being selected for.
"Suppose there's a significant proportion of people who are born because their parents were incompetent at using contraception. If there’s a genetic tendency to be incompetent or fumble at the crucial moment, then there would be, by definition, natural selection in favor of contraceptive ineptitude"