This proposal reports from a pilot study where primary teachers and school nurses were interviewed concerning their collaboration in sex education. These primary teachers and school nurses do not traditionally collaborate around sex education in Swedish schools. Albeit different projects where collaboration between them has been encouraged, earlier research demonstrates problems between the two groups of professionals to act jointly. The new Swedish school law from 2011 prompts such collaboration and asks for school health teams increased participation in sex education in compulsory school. In this pilot study, five primary teachers and five school nurses were interviewed about their collaboration. The purpose of the pilot study was to describe and analyse the teachers and school nurses’ experiences and perspectives of their collaboration concerning sex education among pupils aged 10-12 years. The interviews were analysed with thematic analysis. One overall theme emerged; The classroom is the teacher’s arena, and three sub themes; A collaboration needs two parts; Attitudes is a barrier and Organisation as a facilitator, were found. The results indicate a prevailing distance between the two groups. The nurses claim that the classroom is the teacher’s arena, an arena which is difficult for nurses to enter. The collaboration is usually initiated by teachers not nurses. The teachers assert that the school nurses are professional resources in school and experts on different health issues, such as menstruation. While the school nurses regard the head master as important for how sex education is facilitated and implemented in school, the teachers claim to manage sex education without the head master’s influence. The results indicate that the new school law where school health team is involved in the science education has not been implemented at the schools in the present study.