An old man was in the red light district and approached a cute little prostitute working the corner. He asked: "How's about some action?" The girl looked him up and down and said: "Old man, I think you've had it!"
To which the old guy replied: "OK... how much do I owe you."
Old Dick is no dope. Here's a piece of advice you should always follow: Whenever you have a one night stand, always use protection -- a fake name and a fake number.