I think that I've actually seen a few fics that took canonically presumed-straight characters and tried to make them fit into "gay culture" (which I still haven't seen defined). I remember laughing loudly and pressing the back button. It was so OOC I couldn't take it seriously. There's only so much that can be done within the confines of a pre-established canon without warping it.

There are a couple of characters who I'd like to watch try to fit into GLBT culture. But what would make it funny and/or interesting would be how they didn't fit in.

In once case I went the opposite direction, and had the character thinking how "those people" weren't like him and his (male) lover. Because for that character, that kind of denial/homophobia makes sense.