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Pubic hair is quite different from hair on the head. Instead of forming a round shape, the hair is oval. It is always short and has a coarse and curly texture. The growth period for pubic hair is short. Within six months, the hair follicle dies and the hair falls out. Pubic hair never gets a chance to grow.
It is not certain why pubic hair grows in the groin and under the armpit. One theory suggests that it provides a large surface area for the natural smell of sweat to disperse from. Many animals use the odour of sweat to attract the opposite sex.
You are quoting from the BBC's article ... that was the piece of reading material the teacher used to explain to her class!