Two parents take their son on a vacation and go to a nude beach.

The father goes for a walk on the beach and the son goes and plays in the water.

The son comes running up to his mom and says, "Mommy, I saw ladies with boobies a lot bigger than yours!"

The mother says, "The bigger they are, the dumber they are."

So he goes back to play. Several minutes later he comes running back and says, "Mommy, I saw men with penises a lot bigger than Daddy's!"

The mother says, "The bigger they are, the dumber they are."

So he goes back to play.

Several minutes later he comes running back and says, "Mommy, I just saw Daddy talking to the dumbest lady I ever saw and the more and more he talked, the dumber and dumber he got!"