I'm a bisexual guy in my early twenties. The thing is, no one knows that I'm bisexual, outside of the guy I hooked up with a few times in the past, and I found him anonymously online so as to be discreet as possible. I have a great and loving relationship with my girlfriend, whom I've been with for a while now. We love each other a lot (and have great sex). She doesn't know that I'm bi, nor do my family or friends.
Here's the thing, though: I'm definitely bisexual, and I've come to terms with that and accept it completely. However, I'm not bi-romantic, or however you want to put it; that is, I have no interest in being in relationships with guy, falling in love with guys, etc. Sex with men is a purely sexual thing for me. So, whereas when my girlfriend and I have sex, it's so much more than that for both of us, when I have had gay sex, it was purely sexual. I just wanted to have fun, hang out, and get off.
So the issue becomes, because I don't ever plan on being in a relationship with a man, who do I really need to tell? The way I see it, I should probably tell my girlfriend because as my sexual partner, I want to let her in on a big part of my sexuality, even if gay sex isn't necessarily something we can do together. Now, ideally, I would tell her about my sexuality, and how sex with men is just sex to me, and she would say, "OK, FishBook! If it's just sex to you, then you can go out and fuck all the men you want as long as you stay protected and still have great sex with me." I'm not an idiot, though, and I know that she probably (almost definitely) wouldn't react this way, nor necessarily should she. It would, after all, be cheating. Even if I would know that hookups with men would mean nothing to me emotionally, she would definitely have the right to feel jealous. I do think that she would be accepting of my bisexuality; I just don't think she'd let me fool around, and I can't blame her for that.
As for my family and friends, I'm not so sure whether I should come out. I don't think I need to come out to my parents, because gay sex is a purely sexual interest for me, so I would equate telling them about my desire to have sex with men to telling them if I were into bondage or something: sure, it's part of my sexual identity, but my parents don't need to know about my sex life. As for my friends, obviously it would be hard to do. I know they'd accept me, but I don't know whether it's important to me that they know that about my sexuality.
Basically, I apologize for this huge wall of text, but I just want some outside opinions on my situation. Thanks!