A guy and a girl meet at a bar. They get along so well that they decide to go to his place. A few drinks later, the guy takes off his shirt and then washes his hands. They pet for a while and he takes off her blouse and washes his hands. The action gets real hot and they decide to take it into the bedroom. As they enter the bedroom he takes of his trousers and washes his hands again.
The girl get a puzzled look on her face and says, "You must be a dentist."
The guy, surprised, says, "Yes... how did you figure that out?"
"Easy," she replied, "your cleanliness, you keep washing your hands."
One thing led to another and they make love. After they are done, the girl says, "You must be a good, very successful dentist."
The guy, now with a boosted ego says, "Sure, I'm a good dentist, how did you figure that out?
"I didn't feel a thing." she replied.