Gary Childress
Student for and of life
LGBT oppression ultimately ties back to the material-based oppression of women under capitalism. Capitalism demands a certain amount of control over the reproduction of labor value, both in the immediate sense (rest, sleep, eating, household keeping, all the stuff that enables a worker to return to work again) and the generational sense (ensuring that enough children are being born to guarantee a reliable supply of workers in the future, both to man the machines and also to sustain the pool of unemployed labor), and these together constitute the material basis for the oppression of women under capitalism. But what this also means is a fairly stable identity for men and women, and how they relate to one another in terms of the ability to renew labor-value. The most reliable way is the atomic family: have women be primarily responsible for it, and have men labor. Women are the ones who get pregnant (transmen notwithstanding) and this by itself is a risk for any employer who will lose labor from his workers not working either during pregnancy or after. Also, this tradition already existed in European society (as did the gender binary), and so it was easy and natural for this relationship to morph into one capitalism could use effectively to sustain itself.
LGBT people's existence upsets this cozy arrangement. Homosexual couples generally don't have kids; if it's two men, then they both work, or inevitably one or both have to be responsible for reproducing labor value at home anyway, which is lost productivity. If it's two women, then where is the man to dominate their household? Plus all the other problems with gay couples exist: either one works and one doesn't (lost productivity), both work less (lost productivity), or both work and that's too empowering of an example for other women, to whom they will appear as rebels against patriarchy. Bisexuals fit to this same mold. And transgender people screw around with the generational level of labor-value reproduction: transmen probably don't want to have kids, transwomen can't have kids, etc. And then where do non-binary people fit in this male-female atomic family? Layered on top of this is a very heavy ideological apparatus that guarantees that people stick to their gender binary and their heterosexual relationships, so that the system continues to run smoothly. As with other superstructures, most of the cultural battles happen here, but the material base is the origin of all superstructural cathexes.
But strictly speaking doesn't religion also have whatever level of ties to the mechanisms of capitalism as well? For example, Marx made the famous quip about "opium of the masses". Doesn't that suggest that religion can also be as much of a part of the dynamics of oppression as LGBT can?

EDIT: Thanks for the detailed answer BTW.
