Laoviel
I think this discussion is missing a number of points.
a.1.) Side-point, and food for thought: homins are clearly a primitive society, with far less refinement in thoughts. It could get interesting trying to explain non-binary gender to a primitive mind, even if it's sapient.
Interestingly, the myth of the primitive/primitive thought arose, in part, from the peoples assigned to these mythic categories not recognizing the Cartesian duality at the heart of the western thought, especially the biomedical model.
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