I was commenting mostly in jest anyway. The purpose of the standard is to give a numeric code which is language agnostic, for internationalization of forms and

I was commenting mostly in jest anyway. The purpose of the standard is to give a numeric code which is language agnostic, for internationalization of forms and software. Adding other genders isn't really applicable, since there's no common meaning or terminology across languages. M and F are universally recognized because they're grounded in reality: Every language in the world has a term for them.