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 back, but she decided to just tell him the
truth. 'It's called sexual intercourse, darling.' Little Tony just
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
Mom wants to talk to you.'