Are there only two biological sexes in humans?

Is biology binary? The question of how many sexes exist in humans splits the worlds of science, medicine, and ideology. For some, it’s clear: XX and XY chromosomes are the unshakable foundation. Others point to intersex individuals and the complexity of gender identity, which defies binary classification. Beneath it all lies a deeper debate: is sex a biological fact, a spectrum of experience—or both? Answer and see whether others think like you—or not at all.