Objective: To explore the impact of the school climate on adolescents' reporting of sexual harassment. Design: A quantitative survey among students in their 4th year of secondary education. Setting: Questionnaires were completed in a class setting. Method: An a-select sampling strategy was used to select 2808 students in 22 schools. Results: Findings indicate that a safe school climate is not enough for students to speak freely or report unwanted sexual experiences. Of more importance is an atmosphere where, generally speaking, sexuality is a topic for (an open) discussion. Conclusion: Good sex education classes (as perceived and evaluated by the students themselves) provide students with the communicative tools necessary to talk about their experiences of unwanted sexual behaviour. (Contains 4 tables.)