Sexuality education is a compulsory part of "The New Zealand Curriculum" for state-funded schools. In 2015, the Ministry of Education has published an updated revision of their official guidelines for schools on the teaching of sexuality education. This paper employs Foucauldian discourse analysis to argue that this policy document, "Sexuality Education: A Guide for Principals, Boards of Trustees, and Teachers," reflects and reproduces particular ways of knowing which constrain possibilities for socially just sexuality education. These discourses include the adoption of an intellectual approach to teaching sexuality, the mandate to measure learning objectives, and a narrow emphasis on positive sexuality. Intentions for the curriculum to deliver a holistic, socio-ecological vision of sexual health as well as one which embeds Ma¯ori values are undermined by dominant understandings of individual action which shape approaches to both sexuality and pedagogy. Furthermore, the liberal recognition of cultural, ethnic, sexual and gender diversity in the curriculum unintentionally reinscribes an unmarked white, secular, heterosexuality as the norm. This paper reflexively critiques the discursive tensions that inhibit the realisation of sexuality education in schools which meets the needs of diverse students and offers it as a possible site for social justice.