Sex is biologically defined by gamete size-it's true humans either produce eggs or sperm or no gametes- never both or something in between https://twitter.com/YeyoZa/status/856529405845352450 …
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It's quite a bit more complicated. Eg. Testis gene/SRY may get moved to X chr, so you get X-X with male phenotypes. https://en.wikipedia.org/wiki/XX_male_syndrome …
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Or XY but with defective SRY gene, or with androgen insensitivity (defect in another gene). https://en.wikipedia.org/wiki/Testis-determining_factor#Influence_on_sex … Biology is messy.
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