I know there's a fair amount of interesting porn in the fandom (I recall one striking one featuring Frodo and the Watcher in the Water) but all the best stuff I remember is rarepairs, I can't think of a particular pairing I go to for porn, and most of the pairings that have been popular enough in the post-movie era to get a lot of explicit fic are pairings I'm not really interested in. Probably if I decided to go deep into pre-3rd-age Sauron-ish stuff I would find my niche.

I'm probably being slightly unfair on Hobbit fandom - the first one, that I also sat through, *was* very pretty, and it did have the Seventh Doctor with a rabbit sledge. And I could see how Bilbo/Thorin was inevitably going to be the pairing that came out of that, but it had nothing to do with them in the books, and also if I want a pairing that is mostly about one of them being condescending and overprotective to the other there's plenty of canon het ships I can look at.