Little Johnny was staying with his grandmother for a few days.
He'd been playing outside for a while when he came into the house and
asked
her,
"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's
called sexual
intercourse,darling."

Little Johnny just said, "OK" and went back outside to play.

A few minutes later he came back in and said angrily, "Grandma, it is not
called
sexual intercourse! It's called bunk beds!"

:)