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I think it's pretty clear that Orcs, Men and Elves biologically are the same species since they are interbreedable. The corruption that Morgoth achieved is mainly a moral one, he corrupted the souls of the to-be-Orcs you might say, yet, not even an Orc is born evil and they can potentially be saved, that Gandalf makes clear in LotR. I think I remember that Tolkien also makes it clear [in The Hobbit] that there are lots of Orcs around even today, and frankly, it hard to argue against that. Orcs aren't magically created monsters with long fangs and green skin. They are us, or rather, the worst examples of mankind.

I mean sure, you can see the difference between an Orc and a Man or an Elf, just as you can see the difference between say a Samoan and a Scandinavian and a West African, but those are "racial" differences and basically: Orcs are Men (and/or ex-Elves if you conscribe to that earlier theory) and they certainly have women because otherwise they simply could not multiply.

Could go further with this but no time for that now...