Don't get it twisted. I've never sucked cock, but if I ever want to try it, guess what? I am going to try it. I will STILL be straight, not bi or gay. I am not attracted to guys. I do consider myself as a "pervert"- very sexual, and if I want to do something sexual, I'll do it, without giving a fuck what anyone thinks or wants to label me as.
It's clear you have NOT read ANYTHING about sexuality at all, besides what you find on this website.
Again, things are not so clear and cut-and-dried, one way or the other. If you read anything at all you would know this. You simply cannot label someone as "bi" or "gay" for a guy wanting to suck a cock, or a girl wanting to lick a pussy.
You could go so far as to say you are gay for wanting to fuck your wife in the ass, or liking your ass licked or fucked, or, even watching your wife get fucked by another guy. We all know that is bullshit. It is all just sex, just fun.
You say you are bi, then great, that means you could go so far as to marry a guy. If not, you are not bi, because you are not fully attracted to guys.