Sex

Sex is when a man injects his penis into a womens vagina. If not using a condom the penis will release a liquid called cum making the women pregnant.

Boy 1: Bro I had sex with the hottest girl ever
Boy 2: What's sex?
Boy 1: It's when you shove your dick in someones pussy
Boy 2: That must be nice
Boy 1: Yeah I'm gonna be a dad soon *smiles*
Boy 2: You're 15....