A guy and a girl met at a bar. The guy's name was Robert and the girl's name might have been Alice, but don't hold me to it. Anyway, they started getting along really well and, as Robert's luck would have it, they decide to go to the girl's place for a drink.
A few drinks later, the guy took off his shirt and washed his hands.
He then took off his socks and washed his hands.
The girl looked at him and says: "You must be a dentist!"
Flabergasted, the guy responded "Yes, that's amazing how did you figure that out?"
The girl said: 'Easy .... you keep washing your hands'
One thing led to another, and, since they are consenting adults and there was no controlling legal authority to stop them, they decided to go bed together. They are in the midst of having what Robert believed was great "relations," when all of the sudden the girl said: "You must be a GREAT dentist!"
The guy was very very surprised, and said 'Yes, I sure am a great dentist ... How did you figure that out??'
Then the girl said, with a big toothy grin, "Easy ... I don't feel a thing."