Orcs are ruined, disfigured and corrupted Elves, so it stands to reason that there would be females, and that Orc reproduction works in the same way as with any other mammal. So where are the female Orcs?
I have two theories that make any sense to me:
-One is that the females are kept at the Orc strongholds, like Mordor, Isengard or Moria, to be used specifically as breeders.
-The other is that since the Orcs are so warped and ruined, that the females actually co-mingle and even go to war alongside their male counterparts, physically appearing utterly indistinguishable from the males.
I know there is that scene in the movies where Orcs are being pulled out of membraneous mud-pits, but if one reads the Silmarillion, this is not canonical. Plus, in the movies, it seemed as though all the Orcs "born" this way were Uruk-Hai, and therefore crossbreeds of Orcs and "Goblin-Men", so I can see that as being some kind of foul sorcery applied by Saruman.
What do you guys think?