alt-text for thumbnail: The words: ““biological” sex is the gender binary” on a 2d digital art wooden background next to the non-binary flag
Obligatory video; didn’t watch, but biological sex is medical/scientific term, not a social one. The fact that some people are intersex doesn’t detract from that, it’s just part of the medical definition. Also, it’s not a binary - as I just mentioned, intersex people exist and have a scientifically defined biological sex that is not in the binary of male or female.
Gender is a totally different thing, it is a social construct and also very much not a binary.
How do you define biological sex though?
Especially when someone can change their sex through hormone therapy and gender reassignment surgery, especially if they do it at an early enough age?