I think that throwing around labels regarding this guy's question is not really the answer. By saying I am straight but I love cock is something that I think a lot of guys have at least thought, if not said it on boards like this. Many guys have experimented sexually with another guy at some point in their lives, but may not be totally pursuing further sexual contact with other guys. They may be married, have families and still have these thoughts.
The only label for that is that they are a guy and have thoughts about sucking another guy's cock. Maybe they tried it once and enjoyed it or maybe they have never tried it, but have had another guy suck their cock and now wonder what it would be like. Maybe they just get turned on watching all kinds of videos and have now found that the guys' cock in those videos (or pictures) also turns them on.
I can tell you that for me personally, I have never sucked another man's cock, I had mine sucked by another guy as a teenager and found it enjoyable at the time but have not experienced it since. I am married, have children and grandchildren, continue to have sex with my wife, but am also very curious about sucking another man's cock.
Even if I would act on that curiosity, I am not subject to anyone's labels. I am strictly a man curious about sucking cock, not kissing another man, not any sort of romantic feelings towards another man, not living with another man and not my wife, etc. Just plainly interesting in knowing what it would be like to suck another man's cock.