Biology not being my specialty, I would consult a standard reference for the term. This one seems decent "of or denoting the sex that can bear offspring or produce eggs, distinguished biologically by the production of gametes (ova) that can be fertilized by male gametes."
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Right, but I don't think that means we would describe sex as a 'spectrum' - rather than a binary i. e. Spectrum is continuous variation along a scale between two extremes (like height)
Infertile men are not on a spectrum somewhere between being men & women though (& vice versa). I don't think the fact of infertility, intersex conditions or other birth 'defects' mean that ppl who say they are gay, lesbian, straight etc..have fallen for a falsehood
