"Gay sex" can become an obsession, but it's not a fetish. A fetish is a sexual fixation with inanimate objects. Like a shoe fetish, or a leather fetish.

I'm guessing you refer to my post in that other thread. I'm still going with: straight men are sexually attracted to women, bisexual men are sexually attracted to men and women, gay men are sexually attracted to men, asexual men have no sexual attractions. I still don't buy the concept of straight men having sex with men. And I still don't buy the rationalization that "sexual" means "emotional attraction." Otherwise, the straight guys would be called heteroemotional.