An Arizona couple, both well into their 80's, go to a sex therapist's 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 finishes, the doctor says, 'There's absolutely nothing wrong with the way you have intercourse..' He thanks them for coming, he wishes them good luck, he charges them 50 and he says goodbye.The next week, the same couple returns and asks the sex therapist to watch again. The sex therapist is a bit puzzled, but agrees. This happens several weeks in a row. The couple makes an appointment, has intercourse with no problems, pays the doctor, then leaves.Finally, after 3 months of this routine, the doctor says, 'I'm sorry, but I have to ask. Just what are you trying to find out?'The man says, 'We're not trying to find out anything. She's married so we can't go to her house. I'm married and we can't go to my house.The Holiday Inn charges 98.The Hilton charges 139.We do it here for 50, and Medicare pays 43 of it, leaving my net cost of 7.