Male, and if you want to make categories, bisexual, although I'd say we all are in one degree or another. I believe there is a scale for it, but I can't recall it.
That being said, I've had one significant other in my whole life and still have her and I really hope I get to stay with her for life.
Lovely misconceptions:
1. No, I do not need to be with a dude once in my life. As I said, I have a girlfriend and I want to stay with her.
2. No, it doesn't place extra strain on the relationship or whatever.
3. No, I'm not a poseur. Yes, there are a lot of poseurs. That doesn't mean everyone is.
4. No, I'm NOT more likely to cheat. I never understood this conclusion.
5. No, I don't secretly want to fuck all of my friends' brains out. Ever heard of a friend zone? Besides, as I said, I have a girlfriend.
6. No, I don't need a threesome. Yes, it sounds hot in theory. No, I would not want to experience one in reality.
7. No, I'm not more likely to be attracted to people. I'd say I'm extremely shallow, despite being average myself. Yes, I'll like other average people if they have a great personality. But I won't want to fuck everything that moves, either.
Not that anyone knows I am, other than my girlfriend and whoever reads this post. But I could care less.