Make it about cock. i have been with guys and it's always about their cocks.For me to get aroused by another man, his cock would have to be big like mine. I'd have to almost see him as a threat (competition). In that case, if he's a hot-looking dude (tough and masculine), I could lose control. Not sure.
Gay men in general never turn me on. Most men don't arouse me -- just a very certain type of man I might get jealous of.
Interesting thought, though. I keep an open mind. Dudes can be hot in certain situations for sure.