I'm gay as fuck. Growing up, I would think I was bi, but vagina never interested in me. I only watched gay porn. In college, I started watching bi porn, and started to get interested in girls sexually. I've had a couple of bi experiences with couples where we both fucked the girl. It was fun. The guys were hot, so I didn't have any problems. I probably won't get hard if the guy isn't even in the same room. I might, but it's never happened.
I still feel like I'm gay, though. I friend zone all of my girl friends. No way in hell would I want a relationship with a girl. I need a guy. If he were a trans guy, I could see it happening. But I still consider myself gay.