https://www.newstatesman.com/future-proof/2015/02/sex-isn-t-chromosomes-story-century-misconceptions-about-x-y

"the invention of the sex chromosome concept – one that Richardson argues we should reject entirely as a mistake that has led to bad science, societal prejudice and widespread misunderstanding of what sex really is."

“the science of sex has, for some years now, recognised that sexual characteristics exist on a spectrum – not as a binary”