this is just another one of e621's confusing vocabulary that makes me sigh. things like male, female, andromorph, gynomorph, ambiguous_gender are called genders instead of sexes.
i have ideas for how to clean things up but this is mostly to get a conversation going (again?), like i did with intersex tags. Not making this an actual BUR, but here's something:
alias male -> male_(sex)
alias male_(lore) -> male_(gender) (while remaining a lore tag, so the tag-what-you-see policy remains)
alias female -> female_(sex)
alias female_(lore) -> female_(gender)
imply trans_male_(lore) -> male_(gender)
imply trans_female_(lore) -> female_(gender)
alias nonbinary_(lore) -> nonbinary_(gender)
etc.
This is just a foundation, very rough draft, and if things happen i expect it to be a slow process