Why do people moan during sex?

My friend want to know, but is too scared to ask,, I already know but she doesnt belive me..so pls people tell her why ^^ thanks her funmail is downwefall with x's

It's because most people do that to show how excited they are. It's also quite normal to be quite as well.

Maybe it hurts so they are moaning from the pain.

they think its hot so they cant help it!

hey I didnt put that smiley on my answer hey some of my questions and answers show up different I didnt even wright that whats going on here!!!