When my wife and I have sex, I seldom if ever think about her. I am always thinking about other sexy women, people I meet on the street, someone else I know, someone I have had sex with before, thinking she is a prostitute, etc. I always try to create a scene in my mind while having sex with that person. It makes me hot and horny. If I think about having sex with my wife during the act, it doesn't do any thing for me.