As a biologist, I get especially irked at the repeated claim that sex in humans is “a spectrum, not a binary.” In fact, as I’ve discussed several times before (e.g., here, here, here and here), sex might as well be a binary, because the overwhelming majority of people conform to the definitions of either male or female, which involve differential gamete production (sperm vs. eggs), and only slightly fewer fail to conform to a binary of other primary sexual characteristics (appearance of genitalia) or secondary sexual characteristics that appear at puberty (breasts, pubic hair, etc.).
To be a bit more precise, biological sex in humans is bimodal: if you do a frequency plot with “sex” on the X axis and “frequency of individuals conforming to that sex” on the Y axis, you get a huge peak at “male”, another huge peak at “female”, and then a…
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Utopia, you are standing in it! 
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