A mother was trying to explain to her little girl how she had recently become pregnant. She explained how a baby was growing in her tummy, and how it took an egg and a sperm to make the baby. Daddy made the sperm and Mommy made the egg.
Then the little girl asked: “Mommy, if it takes a sperm and an egg to make a baby and the egg is already in your tummy, then how does the sperm get in there? Does Mommy swallow it?”
The mother said: “She does, if she wants a new evening dress.”