"No, but Odette says that Celegorm--Fingon's cousin--says that a number of their physical advantages are tied to a particular way their souls and bodies interact that ours don't--she was explaining human fertility, including a brief explanation of menstruation that didn't go much farther than 'it's painful and gross' and he suggested that she might want to copy it the way we copied their eyes, she declined because it seemed like a bigger change than she wanted to make on that little information, and he admitted that that was a good point and maybe the elf disadvantages had to do with that difference too. I don't know. It doesn't really seem like a practical question, unless Eru shows up demanding to know what we're doing, since the treatment for mortality is the same either way."