Compared to other primates, humans have lost much of the thick hair covering the body. But we’ve kept the visible hair on our scalp, in our armpits, and around the genitals.

But why? What is pubic hair for – and does it matter if we remove it?

There are different theories

Developing pubic hair is tied to sexual maturity. It first appears during puberty under the influence of androgens – the sex hormones – including testosterone.

Researchers have proposed several theories about why humans have retained it.

One theory is that pubic and armpit hair help retain and disperse body scent. Secretions from sweat glands interact with bacteria on the skin to produce odours, which can cling to the hair and gradually be released. Researchers have suggested these scents may play a role in sexual communication – but this work is based on what we know about other species, and has not been established in humans.

Another theory is that pubic hair helps reduce friction and chafing during movement and sexual activity.

Both theories are plausible, but neither has been conclusively established.

Some people worry that pubic hair makes the genital area “dirty”. While they may prefer to remove it, there is no general medical or hygiene reason to do so.

Normal washing is enough for everyday hygiene. For women, washing the external genital area (the vulva) – either just with water........

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