In general, "The Lord of the Rings" is a pretty chaste series. Author J.R.R. Tolkien included some depictions of great longing — Aragorn yearns for Arwen, Éowyn yearns for Aragorn, etc. — but there's nary a description of actual sex to be found. That goes double for elves, who are these perfect eternal beings who seem more angel than man. It's hard to picture them getting down.
. . .but they do. New elves gotta come from somewhere. And it ends up that Tolkien did write a little bit about it, although not in the main text of his novels. Instead, his description of elf sex was found among his voluminous notes, some of which were published in the book "The Nature of Middle-earth," which came out last year.
