A guy went to a psychiatrist because he was having severe problems with his sex life. The psychiatrist asked him a lot of questions, but he couldn't get a clear picture of the problems. Finally he asked, "Do you ever watch your girlfriend's face while you're having sex?"
"Well, yes, I did once."
"Well, how did she look?"
"Oh boy, she looked very angry!"
At this point the psychiatrist felt that he was really getting somewhere. "Well that's very interesting, we must look into this further. Now tell me, you say that you have only seen your girlfriend's face once during sex. That seems somewhat unusual. How did it occur that you saw her face that time?"
"She was watching us through the window."