I still don't think that a human would turn bisexual after living an unnaturally long period of time. Not if he wasn't basically open to the idea from the start.
My point was that with their naturally long lifespan, they probably have a very different perspective on monogamy & casual flings than we "mayfly" humans.
On the one hand, they mature more slowly, and might view casual sex as an abomination, having few partners and/or possibly mating for life.
OTOH, with 2000 years to think about things, they may well feel pretty frisky.
However, even with that lifespan, we know they haven't overrun the world with offspring like humans, goblins or orcs have, meaning they have some kind of combination of a fairly sophisticated view of the environment (a zero-pop growth policy), a strong commitment to sexual self restraint, contraceptives, or an inherently limited fertility cycle.
Remember that Vulcans of Star Trek fame are also long-lived, with life spans similar to that of D&D Dwarves...and they only feel the mating urge every 7 years.
Or the Immortals of Highlander- only able to bear children after earning the right in combat.
The likely results of a race with a 2000 year lifespan with, say, 1800 of those years being fertile and an 18 month gestation period is ecological armageddon.
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They could even be hermaphroditic or, like some RW animals, female for a certain part of their life, and (possibly) male for other parts. Elven sexuality and reproduction may even involve completely different processes- one could be entirely biological, and the other may require magic, for instance. (Consider Storm Constantine's Wraethu, for instance.)
Now, I really doubt that. Elves are humanoids. Their biology will be quite similar to that of humans. The fact that there are half-elves is further evidence that at least elves (and orcs) are very similar in those matters to humans.
1) Just because 2 things look alike doesn't mean they are alike- it merely means they have similar environmental needs. The Cleaner Wrasse and the Sabre-toothed Blenny look nearly identical, but the first lives on the parasites it cleans from other fish, while the latter takes advantage of its resemblance and takes chunks out of the fish waiting to be cleaned. Its called convergent evolution. You see it in Sea Snakes & Eels, Snakes & Legless Skinks, Viceroy and Monarch butterflies, and other species.
2) Hermaphrodism exists in primates- its rare, but it exists. In elves, it could be the norm.
3) The Half- races are, IMHO, merely evidence of the effect of the influence of magic upon genetics. Personally, I'm dumping them in the campaign I'm designing now, and I'm leaning towards axing them from all my games.
A PC may have a bloodline that crosses racial barriers, but its because of long lost magic from a time in the distant, distant path, but there won't be any recent additions.