User blog comment:Johnnytopsidee/aall male and no female husks/@comment-1679409-20121225042748

I'll offer the answer I gave when someone at the ME Answers Wiki asked something similar:

From a technical standpoint, it's probably because it's easier to just have one husk model. From an in-universe standpoint, it's probably because of the methods used to create husks remove much of the organic aspects, much of which are what makes one person different from another. Husks lose their eyes, hair, and muscle mass. I don't think it's too far to assume body fat is converted, too. The skin is obviously altered too. Judging from the pictures, I'd say it looks like something may happen to reproductive organs, too. So, the process takes away eye color, hair, hair color, body shape, skin color, and possibily even sex.

It may also have something to do with selection. The Reapers/Collectors/geth (depending on the game) probably see certain individuals as better suited for being turned into husks (e.g., the ones strong enough to be of some use on the battlefield). Others, like children, the lame, etc. are probably used either to build praetorians or are just melted down.