Every human body, regardless of sex, is internally awash in hormones; every human being, regardless of sex, produces the sex hormones associated with both male and female bodies. And yet, despite both the ubiquity of hormones and the breadth of the functions they perform, somehow only women have ever been saddled with the suggestion that their hormones make them unpredictable, incompetent, and unfit for certain types of work—and only women are commonly dismissed as “hormonal” when their emotions or behavior become inconvenient.