ELI5: Explain Like I'm 5

Perineum

The perineum is the space between your private parts and your bottom. It is the area that’s covered by your underpants. The perineum has a special job which is to help control your bowel movements, urination, and sexual activity. It is also important for childbirth. Because of this, it’s a very important part of your body that needs to be taken care of.