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Why on earth do you need passport control to know what your genitals looked like at birth or what your reproductive biology is? That's kinda weird tbh. If you want to campaign for a sex marker along with a gender marker, crack on.
Well when you ask the Q "sex" that is what the answer implies. Why would your passport (or the government in general) need to include information about your deep inner feelings of gender? (or impose perceptions of these on people because of their sex?)
