Doctors convention.

There's a bunch of doctors gathered together at a doctor's convention one night. A male doctor notices a female doctor from across the room. The female doctor notices also and the next thing you know, they're sitting next to each other by the end of dinner.
After dinner, the male asks the woman if she wants to go up to his hotel room.
''Sure,'' the woman says. ''Let me go wash my hands first.''
After she washes her hands, they have sex. After they are finished, she washes her hands again.
This is really starting to annoy the male doctor so he says, ''You know, you must be a surgeon, because you keep washing your hands.''
Angry at this remark, the woman says, ''Well, you must be an anasthesiologist, because I didn't feel a thing!''