This Article challenges two widely‐embraced theories about how public intimate spaces (e.g., toilets, locker rooms, showers, etc. hereinafter called “bathrooms”) first became separated by sex. The first challenged theory claims that the very first instance of sex‐separation in public bathrooms occurred in 1739 at a ball held at a restaurant in Paris. Under this first view, sex‐separation first emerged as a sign of upper‐class gentility and elitism. The second challenged theory argues that a consistent practice of differentiating bathrooms by sex did not emerge until the late nineteenth century. According to this view, bathroom sex separation was imposed when authorities overreacted to the notion of the intermingling of the sexes as women entered the workplace during the Industrial Revolution. Thus, the second view holds that bathroom sexseparation is rooted in sexism, paternalism, and outdated Victorian notions of modesty.