You can set your gender on the forums to receive a female default head and sounds. It stays in multiplayer.
Changing the shape of the tori to fit a female figure means changing hitboxes and changing how the tori responds to joint positions. If male and female toris respond differently to different scenarios, that means that your set gender could give you an advantage or disadvantage in combat. Not good, and not something that's likely to be implemented.
I don't know what you mean by saying that it's hard to make female textures for the current tori. It's pretty unisex.
Last edited by sleepily; Feb 21, 2018 at 03:25 PM.