As a gay guy, here is my view on it.
Sexuality is a spectrum. So, these percentages on this site are quiet useful in that sense. Some of us are pretty close to 100% one way or the other, but then there are people who can swing both ways (BI). And to add, I believe all these things are biological, brain structure, hormone (during gestation) related..therefore, there is no changing that once birth takes place.
Consider the type of games straight guys will play to prove their "worth", or "sexual power". (a guy basically showing his "moves) They might have a competition to go up to the hottest chick and see who can get her. No matter the orientation, we like to play this, because we all like to show that we have this special quality about us where we can get anybody.
Ultimatley, with sexuality being a spectrum, and everyone having this natural urge to prove they can bed anyone, there would be no bigger boost to a gay guys ego then if they were able to get into bed with someone who considers themselve straight.
I dont know how the sex would be for you, but for a gay guy, this is where fantasies come from.