Another way to put it, is that since their no such thing as ideas (or art) in the abstract or above classes, and that all ideas in society correspond to a class out look. If sexuality is mainly for reproduction then that would put homosexuality as a “choice” (idea).

There is no such thing as individual “truth”, there is only objective reality. Well there is obvious b.s. that is not so hard to determine to what class ideology they belong, like one who says “I’m a Zionist and I really believe that the state of Israel is democratic and should be defended from Arabs.” Well, he can really believe that, but objectively Zionism is just another tool in the hand of the imperialist (the same one who support dictators in countries around Israel) and most of the citizens in Israel cant really practice democracy (beside the point that in class society their no such thing as democracy). Or in art, TV sitcoms or movies who portray Arabs or women in degrading ways are representative of a reactionary class outlook. Or music can be defined by the lyrics or the culture that it represents. On the other hand art or ideas that deal with progressive things would be a representative of a proletarian ideology. What I’m trying to get to is that in general there is no such thing as ideas in the abstract or above class ideology.