It seems to me (and I have not really read any threads concering orkish reproduction), that all Children of Iluvatar have the power to bear offspring, and although orcs may be corrupted Children of Iluvatar, they are his Children nonetheless. Since I see no other logical explanation for how orcs "multiplied" at all the times throughout M-E history when Tolkien said they did, I think it is safe to assume that they reproduced sexually.
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...where the instrument of intelligence is added to brute power and evil will, mankind is powerless in its own defence.
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