Romantic action is my favorite category. I had no idea it was 'wrong.' But I guess that explains why I like it so much.
As for the dramatic hentai - try most any yaoi amvs. The non-yaoi hentai is mostly just sex, but you get more drama in the yaoi sections than outright...what's the word...ramming. I blame the difference on women writing the yaoi animes and males usually writing the non-yaoi hentai shows - yes, I'm sexist. ^_~
I like the idea of sex-themed songs to non-sex themed animes, though. You could really twist an anime where people give each other 'meaningful' looks - who knows what could be running throuh their heads. And then there's symbolism...you could get downright perverted using 'simple innocent' items as symbols for something else.
Sounds like this thread is giving out some fun ideas.