A little boy is waiting for his mom to come out of the changing room while shopping with her. The little boy gets bored and when his mom comes out, she finds him sliding his hand up a dummy's skirt.
"GET YOUR HAND OUT OF THERE!" she shouts.
"DON'T YOU KNOW THAT WOMEN HAVE TEETH DOWN THERE!"

The little boy quickly snatches his hand away and thanks his lucky stars that nothing serious happened. So, for the rest of his life, this poor little boy grows up thinking that all women have teeth down below.

By the time he reaches 16, he finds himself a girl. One night, while her parents were out of town, she invites him over for a little action. After a few hours of making out and grinding on the sofa, she asks him to go a bit further.
"What do you mean?" he asks.
"Well, why don't you put your hand down there?" while pointing to her privates.
"HELL NO!" he cries. "You've got teeth down there."
"No I don't", she responds.
"Yes you do," he says. "My mom told me that you do."
"No I don't," she insists. "Here, look for yourself."
With that, she pulls down her pants and gives him a little peek."
"No I'm sorry" he says. "My mom already told me that all women have teeth down there.
"Oh for Christ's sake!" she screams. With that, she whips off her panties, throws her legs behind her head, and says,
"Look, I don't have any teeth down there."
He replies, "Well, with the condition of those gums I'm not surprised."