Since it's said that
Orcs reproduce in the same manner as the
Elves, I use that as my base of assumption. I also notice that
female Orcs aren't really mentioned. Knowing the
Dark Lord's devaluation of life and his desire for
armies and subjects... I have to assume that the outlook for female Orcs is pretty bleak. It makes sense that in the eyes of
Morgoth and
Sauron, they're little more than factories to build armies. It feels pretty likely that their sole function is to get pregnant and produce baby Orcs. Realistically considering the origins of half-breed Orcs and the
Uruks produces awful, disturbing imagery as well.