Elven Interfertility (CBE)

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Elves have been known to produce children with beings of other races. Most of these are the offspring of a union between elves and humans. Elf females sometimes find themselves drawn to human men for a brief while, and human women cannot resist the charms of certain elf males. The child of these unions is usually born and reared in the civilization of its mother; elf males rarely want humans in their lands, and most elf females don't want to bear a child outside the elven realms, nor to abandon it to humans.
While elves may dally with members of other races, there is usually no offspring from such unions. Something in the natures of the races involved makes such a child distinctly improbable. Only with the aid of strong magicks or unforeseen coincidences has there been any result from these dalliances.
Apart from the physical differences, elves find most other races unappealing in appearance. Dwarves have their beards, and halflings have their hairy feet and considerable girths. While elves may get along with these races, they do not, for the most part, seek to grow any closer than good friends would.
Thus, while elves may be physically interfertile with other races, they generally choose not to be. While there are many half-elves in existence, most of those known are of human descent. One or two half-elf/half-dwarves have cropped up in legends, but little remains of what their abilities were like or what the circumstances of their births were.