Why Did Our Hair Evolve To Grow In Odd Places?

Compared to most primates, we as humans are relatively hairless. Why is this and how did we come to have hair in such odd places?

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Did Climate Change Drive Human Evolution? (NPR)
"There's a plan afoot among evolutionary scientists to launch a big new project - to look back in time and find out how climate change over millions of years affected human evolution."

Are Human Pheromones Real? (Scientific American)
"Strange as it may sound, some scientists suspect that the humble armpit could be sending all kinds of signals from casual flirtation to sounding the alarm. That's because the body's secretions, some stinky and others below the threshold your nose can detect, may be rife with chemical messages called pheromones. Yet despite half a century of research into these subtle cues, we have yet to find direct evidence of their existence in humans."

The Evolution Of Hairy Men: Why More Hair Attracts The Opposite Sex, Indicates Greater Health (Medical Daily)
"Everyone has hair, but why do men tend to have so much more of it? While men and women, too, have the same number of hair follicles, men have more of what's called terminal hair: visible, thick hair that's usually associated with the hair on a person's head or pubic hair."