One night a man and a woman were at a bar knocking back a few beers.
They started talking and come find out they're both doctors.
After about an hour, the man said, "Hey, how about we sleep together tonight. No strings attached. It'll just be one night of fun."
The woman agreed so they went back to her place and he went into the bedroom while she went into the bathroom and started scrubbing up like she was about to go into the operating room.
She scrubbed for a good seven or eight minutes.
Finally she went into the bedroom and they had sex for an hour or so.
Afterward, the man said. "You're a surgeon, aren't you?"
"Yeah, how did you know?" she replied.
The man said, "I could tell by the way you scrubbed up before we started."
"Oh, that makes sense," said the woman. "You're an anesthesiologist, aren't you?"
"Yeah," said the man, a bit surprised. "How did you know?"
"Because I slept through most of it and didn't feel a thing," she answered.