Gender Trait question

[Metana]

Hi all,

 

I'm attempting to create a mod that will automatically make all male sims (as a default) both able to impregnate others and become pregnant - I've got the option in CAS down so that you can pick both, but when I try and set that option to be the default for men the game recognises these characters as male and changes their pregnancy settings to "Can impregnate" and "Cannot be impregnated". (It's fine when I don't put it as the default for men - the game assigns a "Custom gender" trait to them and it isn't overridden)

 

I think what I need to do is change the "Trait_gendermale" file in the game so that it doesn't override this, but I'm not sure how. I'm having trouble reading the file or figuring out how it's overriding my choices. 

 

Does anyone have any advice or resources I could look at to understand the games trait files? Googling hasn't found much so far.

 

Thanks!