I think Orks wouldn't work the same without them being an Asexually reproducing, fungual/mamalion being.
They wouldn't reporduce as fast, wouldn't be as resilient as they are now, they would spread to every world in the galaxy, they wouldn't be the utopian survive race they are if they had two sexes.
If you want women then play the Nuns with Guns. I want my army right proppa and de'd 'ard, and thats the way Orks are now so i like them just fine thank you.