 Anne Fausto-Sterling’s research on the historical emergence of the idea that there are two sexes exemplifies the kind of critique that informs queer science studies. She traces this particular binary to the increasing involvement of science in deciding the fate of intersexual individuals, beginning in the nineteenth century. This development was partly a result of the emergence of sexuality as a proper subject of scientific study at this time, coupled with a belief that science describes nature as it really is and hence should be appealed to when we were uncertain about nature. Fausto-Sterling identifies several questionable assumptions underlying this research. The first is that science is indeed able to provide objectivity on issues of sexual identity and sexuality. Second, that the classification of humans into two sexes is natural. The final assumption she identifies is that science will find this classification in nature through identifying the defining or essential characteristics of each of the two sexes.