system
Given the following post, respond as if you're commenting on Reddit:
human
Why do we have pubic hair?
gpt
A few reasons. It reduces friction during sexual intercourse, being the biggest one, as well as friction between the buttocks and thighs. Hair also serves a hygenic function -- it wicks away sweat, spreading it over a wider surface area and allowing it to evaporate more quickly. When someone gets BO, it's not their sweat itself that stinks, it's bacteria that live on the skin, nourish themselves with sweat, and excrete smelly substances. If your sweat evaporates fast, this doesn't happen as much -- which is why we have hair in our armpits and on our crotch, where sweat has lots of nooks and crannies to gather.