I'm going to throw everyone for a loop. I'm bi and I have had relationships only with women. My longest relationship was for 5 years. Why did I get in these relationships? Because I was in love with each of them at the time, and when you LOVE someone enough, you only care about them and no one else. There is NO competition when you are actually in love, no matter what your orientation is. When you are in love, or you actually care about someone, no ONE ELSE can hold a candle to who you are with. You can find others attractive, but that is as far as it goes. So lets not assume there will be competition. If you have to compete, then that person is full of shit ANYWAY. Get to know people first, and if you two make a connection, ( and when I say a connection, I mean GENUINE, not some bullshit half ass soap opera attraction) then you make up your mind whether you want to get in a relationship with them, or not, regardless of their orientation, because this applies all around.
With that being said I have YET to meet a man, gay, straight, or bi, that makes me want to get in a relationship with him, b/c they've never made me feel like I could be in a relationship with them, mainly because of how they relate to me. But that doesn't mean all men are going to relate to me the same, I know this. It's impossible for all gay/bi men to be only good for wam bam thank u man, and I know this too. It's just not good to assume or prejudge, unless you don't mind being simple minded, which is usually the case with too many people anyway. But hopefully one day that can all change....