Two parents take their son to a nude beach. The father goes for
a walk on the beach, while the son goes and plays in the
water.
The son comes running up to his mom and says, "Mommy, I saw women
with breasts a lot bigger than yours!"
The mom says, "The bigger they are, the dumber they are."
So he goes back to play.
Minutes later, he runs back and says, "Mommy, I saw men with
penises a lot bigger than Daddy's!"
The mom 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
they talked, the dumber he got!"