Current scholarship on compulsory sterilization and gender focuses almost exclusively on women as the targets of these programs. As Philip Reilly (1991:98) indicates, however, there occurred a "dramatic change" in the gender of those targeted for compulsory sterilizations in America. Prior to 1928 men were more likely to be sterilized, but, after 1928, women became far more likely to be sterilized. I use this shift as a focal point in examining the changing role of gender. First, I show the ways In which rationales for sterilizatton differed by gender. Then, turning to analyze the shift, I argue that the medical and legal professions criticized the rationales for male stertlization, yet these professions and others tended to 'be more supportive of female sterilization, imagining stertlization to have many advantages for society and women. Superintendents, simultaneously responding to external pressure and shaping sterilization to meet their own interests, transformed steriltzation into a program which focused largely upon women.