Between the late 1950s and mid-1970s, British cinema experienced an explosion of X-certificated films. In parallel with an era marked by social, political, and sexual ferment and upheaval, British filmmakers and censors pushed and guarded the permissible limits of violence, horror, revolt, and sexuality on screen. Adult Themes is the first volume entirely devoted to the exploration of British X certificate films across this transformative period, since identified as 'the long 1960s'. How did the British Board of Film Censors, harried on one side by the censorious and moralistic, and beset on the other by demands for greater artistic freedom, oversee and manage this provocative body of films? How did the freedoms and restrictions of the X certificate hasten, determine, and reshape post-war British cinema into an artistic, exploitational, and unapologetically adult medium?