A man and a woman go to a sexologist for a therapy session. The man says to the doctor, "I want you to observe us while we make love." The sexologist accepts.

After having sex, the doctor charges them $50, and tells them that there is nothing wrong in their relationship.

A week later, the same couple shows up at the sexologist's office, they make love, and the doctor charges them $50 and tells them again that there is still nothing wrong in their relationship.

This continues for another month. The sexologist is baffled why they keep coming back. He finally asks them, "What exactly are you looking for?"

The man replies, "We are actually looking for nothing. There is nothing wrong with our sex life. She's married, so we can't go to her place. I'm also married, so we can't go to my house. The Holiday Inn charges $90 for one night, and the Hilton Hotel charges $110. We do it here for $50, and my insurance reimburses me $43."