Sexual intercourse

Little Tony was staying with his grandmother for a few days.
He'd been playing outside with the other kids for a while when he came into the house and asked her, ' Grandma, what 's that called when two people sleep in the same room and one is on top of the other?
She was a little taken aback, but she decided to tell him the truth. ' It's called sexual intercourse, darling. '
Little Tony said, ' Oh, OK, ' and went back outside to play with the other kids.
A few minutes later he came back in and said angrily, ' Grandma, it isn't called sexual intercourse. It's called Bunk Beds. And Jimmy's Mum wants to talk to you. '