How Many Sexes?

Anyone discussing the nature of sex and gender on the internet--especially in the context of transgender or DSD (intersex) issues--will likely have been sent millions of times seen this piece titled "Sex Redefined" in the journal Nature.

Just noting here a tweet by the author of the piece:

Not gonna find it now, but should file this with Anne Fausto-Sterling stating on social media that her "paper" about five sexes--males and females, but also herms, ferms, and merms--was "tongue in cheek" and that there aren't really five sexes.

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Might as well also note here this link about the creation of that Scientific American graphic showing sex as a spectrum using DSDs: https://blogs.scientificamerican.com/sa-visual/visualizing-sex-as-a-spectrum/.  Didn't look too much at this yet, but of course the riposte is simple: what's the variable on the X axis?  Are some males really more male than others (which is an implication of it being a spectrum)?