I have a joke, I hope it's not too long. My step dad told me this one a long time ago.
There was a family, dad, mom, and son, who went to a nudist beach for vacation. They set up, and the boy goes off and plays. After a while he comes to his mom, and says "mommy, there are girls here with boobies bigger than yours", and she replies "the bigger they are, the dumber they are." The little boy goes off and plays, and after a while comes back to his mom and says "mommy, there are boys here with thingies bigger than daddies" and his mom says "the bigger they are, the dumber they are." So the little boy goes off to play again. He comes back to his mom and says "mommy, I just seen daddy talking to the dumbest girl I've ever seen, and the more she talks, the dumber he gets!"