Gender locked race?

[Mutemutt]

Then by that logic we should have female Hrothgar. There were female Ronso present in both X and X-2. But we don't.

I imagine that they decided to add Viera first, but knowing they wouldn't add male viera, they decided they needed another race for males. As for why not female viera plus male and female hrothgar, I imagine it's just a workload thing.