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?"