The little girl and boy are fighting about the differences between the sexes, and which one are better.
Finally, the boy drops his pants and said, "Here is something I have that you'll never have."
The little girl is pretty upset by this, since it is clearly true and runs home crying. A while later, comes runnig back with a smile on her face. She drops her pants and said, "My mommy says that with one of these, I can have as many as those as I want!"