I am sure we all know the "Little Johnny" Joke.
Little Johnny was out on a date. He started trying to score. At each juncture the young lady sternly said to Little Johnny. Don't!..... Stop!.....On and on it went Don't!.... Stop!,,,,till finally in spite of her remonstrations, he was fucking her. She is still lamely trying to get Johnny to stop. Don't!... Stop!... Finally the protesting gets softer and softer. Little Johnny thinks he finally has won her over.
Then he hears almost in a bellow Don't ...she draws in a breath.... Don't stop, don't stop!