My boyfriend prefers anal sex over vaginal sex. When we have vaginal intercourse he often needs to touch my anus to maintain his erection. I found porn on his computer and almost all of it involved anal sex between women (none of it was homosexual) and most of it involved BDSM. However, he's never expressed an interest in that in bed or, for that matter, in anal stimulation for him. He's very loving and respectful and we have a very trusting, active and uninhibited sex life. Very often, he is the initiator, but he's keeping the BDSM thing a secret and I'm a little concerned about how much his sexual interests revolve around anal play. I'm wondering if he might be gay. Before our relationship (we've been together about a year) he had many beautiful female partners, but says that the sex was flat and unfulfilling. He also has a lot of gay friends and seems to relate to them more than to straight men in that their non-sexual interests are usually more aligned.