In Australian schools, one significant component of whole-school learning in sexuality education is to provide students with developmentally appropriate curriculum and learning opportunities, with the intention of influencing positive health and well-being. In the situation where the usual classroom teacher is under-prepared or unwilling to teach sexuality education to their students, the use of external providers who are experts in puberty and sexual health is crucial. While the provider is a key influential factor in any sexual health programme, reliance on external providers for the provision of sexuality education in regional Australian cities is not well documented. This mixed-method study aims to address this gap in the literature with a specific focus on Ballarat, where the provision of sexuality education, particularly in primary schools, is heavily reliant on several external providers. Participant schools highlight the need for further positive synergies between the classroom teachers, external agencies and the accessibility of a rigorous curriculum to sustain the delivery of an effective programme to young people in schools. (Contains 5 figures.)