alt Hacker NewsXXY/etc are all variations within a sex. The above poster is correct to point out that sex is defined entirely by the gamete size that one's body is organized around producing in anisogamous species like humans, and is binary.
Intersex is a misleading term, the better term is https://en.wikipedia.org/wiki/Disorders_of_sex_development. There are male DSDs and female DSDs. Even in the case of ovotestes, you'll have one gamete produced, and the other tissue will be nonfunctional.
And yet, the original person I was responding to spoke about gender.
If you are going to step into this argument, please do not move the goalposts
edit: I've triggered the HN censor bot, so editing to apologize to EnergyAmy, they are correct on their point. I am still going to throw back at brigandish that they moved the goalposts