The given research deals with the condition of the restroom in terms of its gendered character. It also seeks to study the historical evolution of its design and the reason for its gender-separation in the first place. Under what circumstances did this sex-separation begin? For what reasons? What does it serve? Why is it continuing until today? What technological developments and what "architectures" has this gender influenced and produced? At the first stage of the research, the concept of gender was studied, as it constitutes the center of this spatial separation. At the next stage, it was examined how gender, with all its "executive effects", influenced the functioning of society in every historical era and played a role in the designing of space. At the final and main stage of the theoretical research, the aim was to investigate and analyze the area of the lavatory in particular, with an emphasis on its public meaning, as a widely gender-charged environment of sexual separation.