A young boy of 5 was staying with his grandmother for a few days. He had been playing outside her house with some other kids when he came into the house.
"Grandma, what is it called when people are sleeping on top of each other?
She was a little taken aback, but decided to tell him the truth. "It is called sexual intercourse darling."
The little guy just said "Ok" and went out to play with his friends again.