One day, A loving mother and her husband take Jimmy to a nude beach.
Jimmy goes and plays in the water.
3 minutes later, Jimmy runs up to his mother and says, "mommy, mommy! I just saw a woman and her breasts were bigger than yours!"
The mother says, "the larger they are, the dumber the person."
So another 3 minutes later, Jimmy runs to his mother again saying, "Mommy mommy! I just saw a man and his penis was bigger than daddy's"
The mother repeats, "The larger they are, the dumber the person."
Finally, Jimmy runs to his mother and says, "Mommy mommy! I just saw daddy with a really dumb woman! And the longer they talked, the dumber daddy got!"