ABSTRACT Through the lens of Feminist STS, we explore Danish newspaper stories about sex hormones. We build on Haraway’sconcept of the material-semiotic and Roberts’ understanding of sexhormones as bio-social messengers of sex to explore how the borders of binary sex/gender are policed in stories about intersex and transgender athletes. We combine these Feminist STS concepts with theconcept of benevolent sexism from social psychology to investigate stories about how women are understood or defined in elite sports. We show that stories about sex hormones often are narrated as stories about protecting ciswomen, and that the argument for hormonal interventions often is entangled in a form of benevolent sexism,implying that stereotypical ciswomen need protection. However, the people who the stereotypical ciswomen are narrated as needing protection from, are not; (a) cismen, (b) a science which upholds a bio-essentialist definition of women, or (c) the cultural norms in organizations dominated by men, but rather intersex and transgender people who challenge (or embody a challenge to) the binary sex/gender hierarchy. In these sports stories, science about sex hormones isused to reproduce a benevolent sexist narrative that reiterates ciswomen as vulnerable and narrates intersex and transwomen as the primary threat.