A man picks up a girl at a party. They proceed to her place and things start to heat up ...
He takes his shirt off and then washes his hands. He takes his pants off and washes hands again.
After watching this for a few minutes, the girl says, „I bet you’re a dentist.”
Surprised he replies, „That’s correct. How did you know?”
„You keep washing your hands, so I figure you’re used to it ...”
They go on and have sex and then afterward she says, „You know what? I’m willing to bet you’re a very good dentist.”
„Oh? How can you tell?” he asks.
„Well, I didn’t feel a thing ...”