I very recently had a feature request that would have looked like the drop down in https://genders.wtf/gender/you-can-only-choose-one/ or worse. We shot that down, but I still struggle with the right way to handle this. Going only textbox seems more inclusive, but I think it's annoying for anyone who identifies as Male or Female to type it out rather than selecting (and you'll wind up with man/male/etc).