Unless you intend to go around feeling up people's crotches -- which, even setting aside the absurdity, is an incomplete solution -- it's probably a lot simpler

Unless you intend to go around feeling up people's crotches -- which, even setting aside the absurdity, is an incomplete solution -- it's probably a lot simpler to just call people what they want to be called. Do you also refuse to use nicknames because they're different from their legal names? What about Internet handles?