The answer appears to be that Tolkien originally believed the Ainur could reproduce, (thus the 'Children of the Gods' in the early drafts) but as his conception of them became more spiritualized decided that they could not.
Most Ainur don't have physical bodies but rather wear semblances of the same in order to interact more easily with the material world of Arda. These seeming bodies are incapable of reproduction.
Melian however assumed a true body of flesh and blood in order to marry Thingol. This body *was* capable of reproducing, (ie: Luthien).
It is likely that the Wizards, being also clothed in bodies of actual flesh, are capable of sexual union and begetting offspring. This is not to say that any of them have necessarily done so but it is possible.
The concept of Pallando or Alatar falling in love and abandoning their mission because of it is an interesting one. It *could* have happened so - and would make a good fanfic.
[ April 29, 2003: Message edited by: Morwen Tindomerel ]
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