Today's Smile - Old Age Sex

A couple both well into their 80's go to a sex therapists office.
The doctor asks "What can I do for you"
The man says "Will you watch us have sexual intercourse"
The doctor raises both eyebrows, but he is so amazed that such an elderly couple is asking for sexual advice that he agrees.
When the couple finish, the doctor says "There's absolutely nothing wrong with the way you have intercourse" He thanks them for coming, wishes them good luck, charges them £50 and says goodbye.
The next week however, the couple return and ask the sex therapist to watch again. The sex therapist is a bit puzzled but agrees. This happens several weeks in a row. The couple make an appointment, have intercourse with no problems, pay the doctor, then leave.
Finally, after 5 or 6 weeks of this routine, the doctor says "I'm sorry but I have to ask. Just what are you trying to find out?"
The old man says "We're not trying to find out anything. She's married so we can't go to her house. I'm married so we can't go to my house. Travelodge charge £93, The Hilton charge £139. We do it here for £50............and I get £43 back on BUPA"