Abstract
Objective: To identify sex education professionals, the strategies used, and the obstacles encountered. Method: a descriptive mixed study with the participation of sixty-eight teachers. A questionnaire was applied, and a script was conducted semi-structured interviews. Data were submitted to simple descriptive statistics and reports to thematic analysis used to construct the collective subject discourse. Results: Most teachers work on the topic mainly through discussion, but the frequency with which these activities take place is minimal and insufficient to promote STI prevention, early pregnancy, combat gender inequality and allow youth to express their sexuality and feelings in a healthy way. Sex education is necessary for the emotional development of adolescents and for understanding the sexual act, emphasizing the consequences in the approach. Final considerations: it was possible to identify the main facilitating aspects and the difficulties in the development of the theme in the classroom. Education and health need to go together, so the existence of nursing professionals at school, working with teachers, is an advance in the effective implementation of sex education.