Board Thread:Suggestions forum/@comment-34241117-20180208032134/@comment-26149161-20180305125939

Orcs aren't sterile, unfortunately. There are Orc women and Orc children, and man-orc hybrids.

The elvish origin for Orcs is not Tolkien's final opinion on their origins. As a matter of fact, he decided in the end that a mannish origin is the most likely, and shifted the timeline to reflect that.

Ithilion, Discussions Moderator (Auta i lómë)