A fairly young, fairly attractive couple go to see a doctor and say they’re having trouble making love. “Could you watch us and correct any mistakes we might be making?” asks the guy.
The doc thinks it a bit unusual but says “OK.”
He watches for a while, offers a couple of suggestions and when they finish says “Well, things look pretty good to me, you don’t seem to have any problems.” To which the couple respond with “things don’t feel exactly right, do you mind if we come back next week for a little more guidance?.”
The doctor agrees and the couple return the following week. Once again they repeat the performance, get a tiny bit of help and leave quite satisfied. On the third visit the following week the doctor says “Look, I really don’t see any problem here, in fact I wish my love-making was as good. Why do you keep coming back?”
The young man says “Well, to tell you the truth, I’m a guitarist in a rock band, live in a smelly old squat and don’t make much money. She’s married to this other guy who works from home so we can’t go there. I can’t afford to take her to a motel. This place is warm and friendly, we get free coffee and magazines while we wait and I get all the costs back from Medicare.”