People answer because they are conditioned to think they have to. When I was leaving, the therapist I saw said, just because someone asks you a question, doesn't mean you have to answer it. It was empowering at that time, because it put me back in control of my life.
i told a relative of mine to answer with "that is a private matter and it would be disrespectful to myself and my girlfriend to discuss our sex life with other people."