to social structure. However, there are scholars who argue that sex is also socially constructed. For example, gender studies writer Judith Butler states that "perhaps this construct called 'sex' is as culturally constructed as gender; indeed, perhaps it was always already gender, with the consequence that the distinction between sex and gender turns out to be no distinction at all." She continues:It would make no sense, then, to define gender as the cultural interpretation of sex, if sex is itself a gender-centered category. Gender should not be conceived merely as the cultural inscription of meaning based on a given sex (a juridical conception); gender must also designate the very apparatus of production whereby the sexes themselves are established. [...] This production of sex as the pre-discursive should be understood as the effect of the apparatus of cultural construction designated by gender. Butler argues that "bodies only appear, only endure, only live within the productive constraints of certain highly gendered regulatory schemas," and sex is "no longer as a bodily given on which the construct of gender is artificially imposed, but as a cultural norm which governs the materialization of bodies." With regard to history, Linda Nicholson, a professor of history and women's studies, argues that the understanding of human bodies as sexually dimorphic was historically not recognised. She states that male and female genitals were considered inherently the same in Western society until the 18th century. At that time, female genitals were regarded as incomplete male genitals, and the difference between the two was conceived as a matter of degree. In other words, there was a belief in a gradation of physical forms, or a spectrum. Scholars such as Helen King, Joan Cadden, and Michael Stolberg have criticized this interpretation of history. Cadden notes that the "one-sex" model was disputed even in ancient and medieval medicine, and Stolberg points out that already in the sixteenth century, medicine had begun to move towards a two-sex model. In addition, drawing from the empirical research of intersex children, Anne Fausto-Sterling, a professor of biology and gender studies, describes how the doctors address the issues of intersexuality. She starts her argument with an example of the birth of an intersexual individual and maintains "our conceptions of the nature of gender difference shape, even as they reflect, the ways we structure our social system and polity; they also shape and reflect our understanding of our