https://msmagazine.com/2024/08/12/women-athletes-sex-change-trans-olympics-imane-khelif-intersex/
Chromosome Count: Who Gets to Decide Which Athletes Are ‘Feminine Enough’ to Compete? In Defense of Imane Khelif
Indeed, it's why I get so tired of the expression "it's basic biology" when there's a discussion about gender purity. Biology is so bad at doing binary expressions of anything that trying to create a binary classification of gender expression fails every time. There was a fantastic video I watched of a guy trying to create an iPhone settings panel of gender expression to capture all the myriad ways that gender is expressed in humans. He borrows a phrase one of the researchers used in their research, that gender is a constellation, rather than a spectrum.