http://www.urbandictionary.com/define.php?term=sex&f=1
"A painful activity in which a man, using the stiffest and pointiest part of his pelvic region, repeatedly stabs a female in her crotch until he feels satisfied. Can also take place between two men, in which one male stabs the other in the bum. Lesbian "sex" may be fun and all, but it aint real sex unless there is some sort of stabbling going on, perhaps with a cleverly shaped hand or steel dildo."