[Tuor Turambar,Cursed by the Valar]

When/if men are mixed with orcs, as discussed in other threads, what happens to the children? As i understand it, orcs are corrupted elves, and as such are immortal, while men are mortal.
When elves and men marry, then the elves become mortal, and the children have a choice (Elros/Elrond). Does this happen with orcs?

I am assuming that men do breed with orcs, because elves do not reproduce fast enough to create large armies. And orcs do, as far as i know, reproduce in the manner of the children of illuvatar.

There are many threads on similar topics, but not the same topic, do not turn this into a discussion of those topics.

BASIC IDEAS:
Orcs are corrupted elves
They were, in the first or second age, bred with men. This also happened in the third age.
Orcs reproduce like men and elves