Since I'm not allowed as per terms of board agreement, to give false information

, consider this merely
fanciful, and non-canonical...Sex, where sentient beings were involved, was sacred in Tolkien's Universe, since beings act in consort with their Creator (i.e., Eru-Illuvatar) as sorts of "sub-creators", which fits well with Tolkien's views on the crafting of fantasy itself. Now Tolkien might have let Melkor breed Orcs in mockery of Elves, but he might have used other genetic material to
get the job done, kidnapping and torturing Elves, the first of the "Erusen" he encounters, simply to figure out
how to get the job done (besides the obvious urge to Sadism). But I probably trip over myself on that point, because, the only other theory other characters give in Tolkien's world, other than your basic "They were Elves once..." story, is one Elf in the Unfinished Tales, who thinks they were bred from Druedain ("Woses"), supposedly endowed with elf-like qualities...(you end up thinking, yeah, sure, no one wants to be thought of as the Bad Seed's kin!). The upshot is that any likely suspect would still have a Tolkiensque
soul.
Orcs don't. Also, Orcs have got to be close enough to Humans genetically to create viable offspring (our Uruk-Hai). So Melkor, who can never truly create, certainly couldn't have given Orcs a "normal" means of reproduction, which would mock the communion that other intelligent beings would have with Eru, in the creation of a soul-endowed lifeform. Even more so for Elves, Men, and by adoption Dwarves, who are the
Offspring of Illuvatar.
I know everyone has read somewhere where orcs are said to spawn, in the manner of frogs, perhaps Tolkien said so. I'm not trying to say now that they are dolled-up frog meat, I'm trying to think about how frogs spawn. The males, who have driven off or eaten all the other rivals in their territory, deposit their genetic material on clutches of extruded eggs. The eggs develop independent of the parents, and in most cases, with little care or concern on the part of the parents.
So here's the completely fanciful part. Orcs are neither female OR male (in Arda, I mean), they are just ORCS. They are Hermaphrodites. When one larger or more powerful orc takes control of its band, "it" might, after a certain cycle of time, put on a display or release a scent, and the others go in estrus and go to a safe place in the territory, and release their eggs, and the (for the moment, "he") first orc fertilizes them. Orcs develop together from these fish/frog-like eggs, the outer membrance drawing substance from the mud and loam surrounding it. Each young in is trained in their clutch-group, cultural norms, skills, violence (even against other species!), the most promising chosen out for learning important skills like making medicines ("harsh, but effective"), explosive making, smithying, or any number of things a potential several thousand year old orc could teach. They too, were immortal.
We know that most orcs of the Misty Mountains started out small enough for Gollum to choke. We know from the "Scouring of the Shire", that Saruman had half-orcs (or at least half-orc looking men), who were not Uruk-Hai. Orcs may have outpaced their kindred Elves in breeding speed, but they may not have been as prolific as Men, given their probable stock of origin (the Elves' largest group of siblings, the Sons of Feanor, were only seven strong). Uruk-Hai were evidently bred for reproductive speed and quick maturation, as well as viciousness, daylight resistance, and speed. It took Saruman some doing to get the Uruks right, like Edison at the lightbulb. There were cast-offs.
Some orcs were bred for specific tasks, like "tracking orcs", or maybe even the Wolf Riders. How this could be done, I don't know. Azog could have easily have been the "Father" of Bolg, under this scenario above, 'though how inbreeding was avoided is difficult to fathom, and a weakness of this solution. But then again, look at the orcs--could inbreeding have been considered
harming them? I mean they're already ORCS, for crying out loud! :nazgul:
Thanks for reading, and putting up with misspellings.
PS--The only Dwarf-woman mentioned in Tolkien's writing, to my knowledge, was Dis, the mother of Fili & Kili, two members of Thorin & Co.. She fought valiantly in the last battle of The War of Dwarves and Orcs (or was it Orcs and Dwarves? Ach...only the winners get to write the Histories, or is it the whiners? I can never keep it straight). Anyway, Dis wasn't the kind of chick to tie ribbons in her beard...