d4m10n
Penultimate Amazing
I don't think it makes much sense to analogize from a spectrum to a categorical variable, whether we are talking about two categories (sexes which can reproduce) or three.However, a strict definition isn't necessarily one that answers all questions of category membership. Quite the contrary. It's not difficult to design a strict physical definition of "red" that specifies to within the tiniest fraction of a nanometer of wavelength of monochromatic light where "red" becomes "orange" or "infrared" instead. But that definition, due in part to its very strictness, will not distinguish unambiguously between red and orange shades of paint, which are made with mixes of pigments.
That said, the guidance is surely strict here, every individual is sorted into one of two categories as of the moment of conception. This sorting is not particularly pragmatic, though, since it requires inferences from genetic analyses which are not nearly universally performed.
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