Random Question about Dwarves

I'm not sure how this 'arguement' came about, but I was discussing, on mIRC, whether or not Dwarves had the ability to mate with Elves or Men. Elves are able to reproduce with Men, and the three races aren't that different. But I've heard that because the Dwarves creation was, at first, unsanctioned by Iluvitar(sp?)they cannot and that's what seperates them from the other races. I think that Dwarves can mate with other races, thought they would have no reason to and are above the other races, so any offspring would be of a lesser class than a pure-Dwarf offspring. What are your thoughts?

[ January 03, 2003: Message edited by: Throrin ]