My one buddy is a total rough neck. He loves pussy and women like no tomorrow. However, he's into swinging/hotwifing, and always wants his woman with a well-hung stud. He doesn't like full-on gay sex, but he'll stroke your dick and "feel you up" at some point when you're with his woman. He's totally into looking at naked stud with a big dick. If you're not well-hung, he probably wouldn't have any interest you in a sexual way. It's all about the big dick with him.
He's into my Big Boy Dick like crazy. We don't kiss, or have penetrative sex. I wouldn't suck his dick, either. But in the heat of the moment, he might grab your and put it in his wife's mouth. Or feel up your ass when a little when you're doing his woman doggy-style. It's all good.
I'm not that comfortable with a dude sucking my dick -- just not aroused by it. But some light male bisexual acts are fine, and even very enjoyable (competitive spirit, connection, etc.).
Swinging/hotwife lifestyle = men are at least light bisexual. Now that doesn't mean that you're going to do certain every gay act, etc -- not all. It all depends on their true desires, insecurities, connection to the man, etc.