I usually don't think about other people's sex lives because it doesn't even cross my mind. I'm single but I don't particularly miss being in a relationship so other people's sex lives are just of no interest to me. Having said that, when it comes to my therapist every single piece of information about her is fascinating to me so of course, her sex life is something I think about occasionally. It makes me uncomfortable to be honest because I have maternal transference and imagining your parents doing it is just yuck.