The United Nations (UN) deploys peacekeepers worldwide to help build peace and security. Meanwhile, a serious problem persists: sexual exploitation and abuse (SEA) perpetrated by peacekeepers. Despite extensive efforts, including codes of conduct, sanctions, and training, reports of sexual abuse by peacekeepers continue within mission contexts. By drawing on UN documents aiming at ending SEA by regulating peacekeepers’ behaviour, this blog article examines the gender dimensions of the rules. I argue that a military masculinity culture is reflected in the UN rules that perpetuate instead of fight the risk of SEA.