Two teenagers walk through a park and see two rabbits getting it on, fast and furious.
"What are they doing?" asks the girl.
"They're jumping rope," says the boy. "Maybe I'll teach you how someday."
"I want you to teach me now," says the girl. So the two go behind some bushes and start getting it on. When the boy has his pants down, the girl asks, "What's behind your 'rope?'"
"That's my knot," says the boy.
"Well," says the girl, "untie the knot and give me some more rope."