Pornography often depicts traditional gender norms and aggression paired with sexual behaviour. Among adolescents, exposure to pornography is related to unhealthy beliefs about gender, sex and relationships. Critical thinking about media may reduce the internalisation of unhealthy messages in pornography. However, there is a dearth of research examining how critical media attitudes are protective of youth in early adolescence. Using a US sample of ninth- and tenth-grade students (n = 558; M[subscript age] = 14; 53% female), this study examines how the relationship between frequency of pornography use and acceptance of traditional gender norms, dating violence and rape myths may be moderated by critical media attitudes. More frequent pornography use was related to greater acceptance of rape myths and gender norms, but only for adolescents who were less sceptical about media messages. For adolescents who were sceptical of media messages about sex, there was no relationship between pornography use and their acceptance of rape myths and gender norms. This study provides preliminary evidence of the protective influence that critical media attitudes may have on adolescents' sexual and relationship health. In an increasingly digital world, it is critical to provide early media literacy education as part of sexuality education to promote adolescents' health.