My therapist told me yesterday that many people (specially women) fantasize about other people in order to get an orgasm. In her opinion, about 80% of women create a movie in their head that they use over and over again when they want to get an orgasm. In many cases, the people they imagine do not exist and this would have little to do with their feelings towards their real sexual partner.

I found it hard to believe that the majority of people do this, but I have no idea. I don't think I have never fantasized about other people when having sex.

Do you fantasize about other people during sex? With whom? Does your partner know about this?