Well ... riddle me this ... what's "sex"? ... I mean, isn't part of the problem that people tend to equate 'sex' with sexual coitus or, at least, sexual activity resulting in orgasm? ... now, in that case, I'm straight ... the idea of another man being anything to do with my having an orgasm doesn't appeal (other than when they're co-starring in a porn movie I'm enjoying ... you know, I wonder, how do the staunch 100%ers manage those moments? ... place a piece of cardboard over the offending part of the screen ... jiggling it back & forth to the rhythm?) ...
... but if I was to say I'd never experienced ANY degree of sexual frisson/pleasure (jouissance as the trick cyclists would have it) as the consequence of another man, I'd be lying ... I distinctly remember having my hair cut once & finding the barber's attentions mildly but unmistakably erotic ... & there's plenty of occasions when my fellow feeling for male friends has had a warmth & intimacy that might quite easily have its roots in some sort of a sexual dimension ...
... but I wouldn't say I'm bisexual in any meaningful sense of the term ... I'm no more bisexual than any other human being who is capable of feeling empathy for & taking pleasure in the physical & emotional closeness of others ... &, at the best of times, the reassurance that represents ...
... so if what we're really asking is: do you like being brought to climax by men or women or both? ... then we've got ourselves a clear question ... but a rather sterile & reductive one ... provided you're capable of fellow-feeling & building a non-coercive relationship to bring pleasure to yourself & others, why should anyone care with whom? ...