grandmas don't know everything!

Little Amden was playing in the backyard with some other boys and
girls.
Soon he came running in and asked, "Grandma, what is it called when two
people sleep in the same bed and one is on top of the other one?"

Grandma was slightly taken aback, but decided that she would be
truthful and address this question honestly. "It's called sexual intercourse."

Little Amden simply said, "Oh, OK", and ran back outside to rejoin the
children at play.

It wasn't very long until he returned and said,
angrily, "Grandma, it's not called sexual intercourse - it's called
bunk beds! And Timmy's mother wants to talk to you!"