Cum

It is a white slimy thing that comes from your testicles. It makes you have baby.

It's sperm

When your the dick gets hard, you are HORNY. That means you like someone and you want to make out with her/him. And so you want to make babies... So... you have to shove your HORNY dick in the pussy to CUM in it then u have baby.

I RECOMMEND YOU TO WEAR A CONDOM THE FIRST TIME YOU HAVE SEX.