I'd presume that in order to breed, any of the Ainur would surely have to take the form of one of the species 'allowed' by Eru as he did not allow creation of new species, Morgoth could only corrupt what already existed, for example. So Melian took the form of an Elf in order to produce a child.
The idea that Orcs were originally created by lesser Maiar taking on physical form is an interesting one...would that logically equate to creating a new species or not though? Would that be allowable?
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Gordon's alive!
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