This thesis investigates the interface between Sex and Relationship Education (hereafter SRE) and young people's lived experiences as mediated by gender, heterosexuality anc. class. The knowledge/practice gap has highlighted how young people either lack sexual knowledge or do not act on SRE messages despite an abundance of information. Assumptions within SRE, however, presume that young people make rational and calculated decisions. This thesis argues instead that young people's experiences. identities and opportunities are mediated by the meanings and values which are generated by discourses about gender and sexuality as well as locally enacted practices.