Sorry if I come off as ignorant, but how does this specific example work?
Gay men "trapped" in a marriages of convenience. Gay men in repressive societies. Gay men with no access to other men who are nevertheless horny as fuck and have a willing partner in front of them.
Maybe I'm just making too many assumptions or your sentence would need more qualifiers, but if you exclusively have sex with women, and assuming you're also only attracted to women both physically and romantically, how could you self-identify as gay?
You're making too many assumptions. Plenty of people do plenty of things they don't enjoy. Sometimes I walk to work in the rain without an umbrella.
Like, how could I, for instance, self-identify as gay? All my romantic/sexual interests have always been women, never men (and, while it could always change, I don't see it change any time soon honestly, if ever). Plus, as far as I can tell, most of my behaviors are not coded gay by the society I live in (or by American society either, I'd wager). How could I "feel" gay in any way?
I'm not saying you could, I'm saying others do.
There are many, many "straight acting" gay men, gay men still in the closet, gay men in denial. If one day they finally come to accept themselves
as gay, they don't have to go out and fuck a guy to
be gay. Their self identification is all that's required.
You say it's a mish-mash of biology and sociology, and you're absolutely right - based on my limited understanding of these subjects anyway - but what would be the biological and/or sociological grounds for self-identifying as gay in this case? Would I even have the "right" (so to speak... I don't mean legally obviously) to call myself gay? Isn't there a point where this becomes factually untrue/misguided?
Self identification does not
have to be honest. But if you lie to yourself, or lie about yourself to deceive others, it doesn't change who you
actually are.
Also, the whole "lying about what you identify as" is pretty much the root of all transphobia / homophobia. I'm not accusing you of this in any way, but it's the same thought process that takes you down those dark roads.
"You're not really X! You're just lying about saying you're X so you get to do Y!"