[Bêthberry]

Hmm. I don't think Luthien and Beren are free of sexual lust. There is an Oo la la Luthien thread here that discusses their attraction for each other. And Daeron is said to love her and for that love betrayed her and Beren.

Maeglin certainly harbours a cruel lust for Idril. Eol also has a cruel lust.

There are several cases of assault and rape as well and women being forced to submit to marriage against their will. This is in the Silm, of course, not LotR.

I think there are suggestions that Aragorn and Arwen do have a sexual attraction for each other. And Eowyn's attraction for Aragorn is very interesting as it mixes her attraction for his power with something else.

I do think there is the suggestion that as the elves age they lose sexual desire but there is eros in LotR. Not writ large by any means, but it is subtly suggested. Sex was not openly discussed in Victorian literature but there's lots of it in those long tomes. It just becomes represented differently from our modern graphic ways.