How do you have fake sex?

fake sex is one person is the girl, the other is the boy. if both people are boys, one of them is the girl. the fake girl gives a head to the boy and the boy puts his penis into the fake girls vagina (the balls of a boy) to make a sex effect. i don't know how it works with girls. anyways, this is not gay, this is just practice for what happens in the real world. i have a girlfriend and i used to do this. alot of people do this for sexual relief or practice.