The rate of sexually transmitted infections (STIs) and teenage pregnancy is high in South Australia (SA), specifically among adolescents and young adults. Research advocates that the latter age group primarily depends on school-based sex education for their health-related behaviours. School-based sex education in SA is delivered via the Health and Physical Education Curriculum (HPE). The present study presents the perspectives of pre-service teachers in SA (N=272) towards three issues in particular: the role of an effective education in promoting health-seeking behaviours, the adequacy of the aforesaid curriculum to addressing sex education in SA, and the factors responsible for a lack of compulsory sex education. Based on the findings of the present study, a 'Cycle of Ignorance' in relation to sex education in SA is formulated. This is particularly significant in the wake of the National HPE Curriculum in Australia. The findings of this study, therefore, have implications for policy and practice regarding sex education in SA.