This was such a great read. I am not a linguist, let alone a philologist, but I had this thought. The modern use of "gender" to mean social aspects of sex (or sex) and the historical use of "gender" to mean sex are still actively used. In a very real sense, these are exclusive and oppositional categories, so any ambiguous use of "gender" in contemporary English should be interpreted as auto-antonymal use. That is, de…
No, they aren't. They are distinct axes of variation, but not opposed. (There are factions which are opposed on normative relations between the two categories, with one holding that the physical category should definitely determine the social one and one not holding to that view, but that doesn't make them antonyms; it does make them potentially confusing if care is not taken to assure what sense “gender” is being used in in a particular context.)