What does self stimulation have to do with only wanting to have sex with other guys? Gay only means that, nothing else. If you like cats, or the color purple, or are a musician, doesn't mean you are gay. Lots of guys self-stimulate as you describe, most never tell anyone about it. Fingering your prostate does not mean your gay. Most men in fact would have much better orgasms if they stimulated their prostates but that doesn't mean that they are all gay.
The Secrets Gay Men Don't Want Straight People to Know
As gay men and lesbians get closer and closer to the mainstream they've often traded in their image as the queer radicals who started the Stonewall Riots for the milquetoast assimilationists who want to get married and have kids and put HRC bumper stickers on their cars. That doesn't mean we're still not queer radicals. It just means we're hiding it from you.
Everybody poops, and hopefully everybody cleans their butt afterward. The thing is, we don't often talk about the whole process. Have you ever wondered if you're dealing with the ramifications of pooping as effectively as possible?