Why do you have pubic hair what use is it?

Your pubic hair acts as a filter to stop dirt and bacteria from entering the body and to help insulate it from the cold. In males, it also helps to keep the testes warm when the body is cold to protect the sperm as well as stopping bacteria. In females it helps to keep the dirt and bacteria from entering the urethra (where you pee) and the vagina. This is especially important when you are pregnant.