This document summarizes the argument that sex, gender, and sexuality are socially constructed rather than biologically determined. It discusses how non-conforming identities like intersex, transgender, and homosexual people were historically pathologized. It also explores how feminist and social movements have advocated for understanding gender and sexual diversity as natural variations. The document specifically examines how the existence of intersex people challenges the idea of only two fixed sexes determined at birth, and how transgender people's experiences question the view of sex as an immutable biological category.