Great thread. I don't know where to start agreeing because there's just too many points out there to agree with, and it makes me feel bonded with guy-dom even more.
I would have to agree that a lot of my bisexual behavior and sexual attraction is driven by unfulfilled needs. I have no siblings, no bond with my parents, brought up in fear of my own father, never got good enough to play in team sports (tennis is my favorite sport), never got super close with a bunch of male friends. My male friendships, whether gay or str8, are mostly one-on-one. None of my gay relationships ever lasted long, nor were they as emotionally fulfilling as my heterosexual relationships.
I think, ultimately, when we do become sexual, many of our needs are sexualised, and depending on our needs the things we do with other men will vary. Some will be "gay" enough, some "curious", some not. I have a friend who came out as gay (although told me secretly that he's bi) just because he's grown sick and tired of explaining himself to people, majority of whom want to see the world in simpler terms, i.e. man and woman, gay and straight. Anything in between just doesn't make sense. They try to understand, sure, but it's the whole explaining bit that's a pain. And then you get people who don't believe there is a gray area, "pick a team" "who's side are you on?" "You're just saying you're bi."
Most of my sexual activity with men are definitely gay enough on the outside, but who knows what goes on inside? Where is it coming from? To me gay sex is fulfilling my need to bond with other men, especially when I'm with another bi guy, I suddenly get a glimpse of some manhood I've missed out on. For a few moments it feels like I actually know what it's like to have had a father, brothers, and a football team. I really enjoy talking about our girlfriends and other guy stuff while we're hugging in bed. The sex was just another part of it, not the main event.
It's really hard to categorise and understand the whole spectrum of male sexuality, what drives it, why it's different for every man, but the best thing about this thread is that it focuses on the gray areas, and brings people just another little step closer to a society where sexuality is no longer an issue.