What many people just don't get is that being straight or gay or bisexual, is a state of being---not a state of mind. If you're a hetero guy then you're not going to be all fixed on doing things like sticking your tongue down some dude's throat---but that still doesn't mean that you're not going to be at all curious about certain other things. I am a man who identifies as bi, but I am more attracted to women than to men. Still, I'm hoping that the moderators will let my post remain in the interst of perspective.
Kissing is more about passion than it is about sex. You can fuck somebody or let them give you a blowjob, yet still have have no desire to kiss or hug them in a way that you would do with somebody that you actually feel some sort of connection with. Most men are neither gay nor bi, and their curiosity to have a sword fight with you doesn't change that. I've hooked up with a lot of straight boys over the years, most of them married. My experience is that they want the mechanical act of messing with another dude but without the emotional stuff, and that's fine---as long as YOU as a gay or bi dude understand that that's all you're going to get out of the deal.
That being said, I do not believe that most truly straight men are interested in kissing or making out with other men---even though they will fuck a man or let him fuck them.I'm very good looking and in very good shape but I don't pay around with straight/married men anymore---no matter how hot they are. There are issues. Besides, I'm a very passionate person who loves to kiss.
Straight boys like their women very much, and they're not going to give them up; so...