As so many will tell you, sexuality is fluid. It does not neatly fit into one category. It shifts, changes, and occasional does these really weird twisty thingys.
For example, I'm a guy who would probably classify myself as "straight" but I find the male body to be stupidly arousing for some reason (Well, below the neck anyway, Dud faces gross me out.) But I would never. Never-ever-ever-ever-ever consider doing it with a guy. Hell, I'd never do it with anyone period, no matter the gender.

Point is, trying to fit yourself into one of the labels that we've created for sexuality (Gay, Straight, Bi, etc.) Is going because more uncertainty than not because, like I said, sexuality has a nasty habit of pulling these bizarre u-turns on us.