This article examines the teacher's role in the classroom and how to include all the students in sex education. To obtain the result, we have examined and reviewed various articles. The articles have been able to answer our question about how to include everyone in teaching. We have examined how religion, culture, LGBT and students with diagnoses can influence the inclusion of sexual education. We have also examined how the teacher should work with the subject to include all of the students in sex education. We have examined how schools can help teachers to include all students and how it can be done. This study is focused on the Swedish primary school. A broad overview of research has resulted in that there is a need for different strategies to include all the students. Teachers, students, parents and other staff in the school has to take responsibility to achieve an including classroom in sex education.