One of the good points that's come up here is that it's possible to find someone attractive, even if they're not someone you're truly sexually interested in. We live in a society that pushes a "this or that" agenda - man or woman, gay or straight, religious or atheist, coke or pepsi...on and on it goes. But the reality of life is that it's never black and white. It's a million shades of grey. If a period of abstinence is what you feel is best for you, sort of a hard reset, then go for it. But remember that it's ok to explore, even without the explicit stuff. Let yourself reflect. Don't be afraid to play around and challenge some of your thoughts and perceptions. What draws you to your girlfriend? Clearly it's something more than the sex, which you've made clear is pretty lackluster. How about that friend that you mentioned fantasizing about? What would it be like to wake up first and make him breakfast? Human sexuality is varied and variable, and even people who firmly align with labels sometimes have exceptions to their rules. That's ok too. I agree with others regarding labels, I'd hold off from adopting one too quickly. Perhaps you are gay - it certainly sounds plausible, likely even - but the healthy thing to do is to feel it out and process it in your own time, never force conclusions while you're exploring. As for your past experiences with women...I've had experiences with women. Some of them were fun enough to repeat, but I still strongly prefer men. We respond to stimuli. A hand touches your junk, the blood flows there...your penis isn't concerned with the gender of the hand, it's happy for the attention. What matters isn't the biological response in your pants, but what's going on in your mind. Do you feel connected with your partner, excited for the sex? If not, if you need a heavy dose of independent fantasy to get through, then something isn't right. Fantasizing about being with a man while having sex with your girlfriend might not mean you're definitely gay, but it is definitely an indicator of something, because you aren't allowing yourself to be fully in that moment with her. My mind often wanders during sex (it's the body dysphoria) but when I start putting some mental distance between myself and my partner, I know I'm with the wrong partner, and the best thing to do is to roll the metaphorical dice and try again with someone else. Just some food for thought.