I'm brand new to this forum, but an "old hand" at being a cuck (well, I used to be a cuck, but that's another story for another time) but prior to actually watching my former wife fucking another man I had never entertained any "gay" thoughts about guys; I just wanted to see her get thoroughly plowed by another man. However, I noticed that as it went on, I began to be more and more turned on by dicks - especially big, white ones (I'm half-hispanic, with a little brown nub of a pecker).
There's just something about big white cock that really turns me on, and while I wrestled with it for some time, I've had to come to the conclusion that I'm definitely Bi. I never participated in their fucking, other than basically "witnessing" and jacking-off while they got it on, and never sucked his dick, but in retrospect I really wish I had, especially after he'd just got done fucking her pussy and ass (not that he would have let me; he thought I was "queer" for wanting to watch them, and I'm pretty sure if I'd attempted to get anywhere near them, he would have beat my ass - he was a much, much larger guy than me). If you have the chance - suck that cock like your life depends on it, man.