In the first chapter of the book, called "Dueling Dualisms" Anne Fausto-Sterling's begins by discussing how the differences between the social expression of gender as well the physical underpinnings of gender have been intensely debated over the last few decades. Sexologists, Money and Ehrhardt introduced the now popular idea that gender and sex are two different and separate categories, with sex as signifying "physical attributes and is anatomically and physiologically determined" and gender as a "psychological transformation of the self" or the "conviction that one is either male or female...and the behavior expressions of that conviction" (3). The 1970's second-wave feminists, for example, believed in these two separate categories and thought
