Sex and Relationships Education is the focus of lively discussions in many countries. In Greece, systematic implementation of such programs has been limited and rather problematic. This work discusses sex education and explores primary teachers\' opinions and attitudes on the issue. Perceptions of teachers are important and influence the successful implementation of any educational intervention. This study focus at four key areas: the school environment; the educator; teaching issues; and students\\\' and parents\\\' issues. The majority of teachers subscribe in the suitability of primary school for introducing sex and relationships education. Sexuality issues are discussed as curriculum-enacted-on-the-spot at the moment and teachers report feeling comfortable in discussing those issues. However, they ask for additional training and appropriate resources in order to teach the subject systematically. In the course of the analysis a number of constraints and implications have been identified. Communication between school, administrative authorities, and families on the issue is limited. The role of the policy makers in developing a feasible course of action has been recognized as central.