One thing Tolkien was quite detailed about was Elven marriage and reproduction, believe it or not. Essentially, everything that's been said in this thread is the crux of the matter. Elves don't marry on a whim or out of passion. And once married they tend to have very few children and that's the end of it. I mean there's Feanor, of course, and Elrond has 3 kids, but this includes twins.
It's also a proven fact that Celeborn and Galadriel have been living in separate
talans for millenia. I joke not.
