I started with LotR slash, too, although at the time I still tended to read it with one eyebrow raised ("this is so weird, I almost can't believe I'm reading it") and to skim over the buttsecks.

One of the most richly erotic such things I ever read was an Elrond/Legolas (I think) where one of them sang to the other in Sindarin while they were getting it on. It sounds kind of silly when I put it like that, but really, it's something you can get away with in elfslash if you do it right. Plus, I am a bit of a language geek.