A little boy accidentally walks in on his mommy giving his daddy a blowjob.  Startled, he closes the door and runs away.  The next day, he says to his daddy, "Daddy, I saw you putting your peenie in Mommy's mouth last night".  The dad says "Yes, son".  "Is that how Mommy get's babies?", the curious boy asks.  "No, son", replies his father, "That's how Mommy gets jewelery".