Joe is having a drink in his local bar when in walks this gorgeous woman. Joe, not being too shy, goes up and sits next to her. He buys her a drink and then another and then another.

After this and the accompanying small-talk, Joe asks her back to his place for a "good time."

"Look," says the woman, "What do you think I am? I don't turn into a slut after 3 drinks, you know!"

"OK," replies Joe, "so how many does it take?"