This work aims at theoretical-methodological reflections regarding the research concerning representations of sexualities and gender in graffiti produced by adolescents in a School Unit in the interior of the State of São Paulo between the years 2018 and 2019. It is an object of study of the political-pedagogical nature of education, of social relations and not linked to purely technical issues. For the methodology we opted for the descriptive-exploratory research, of qualitative nature. We use elements of the Critical Discourse Analysis (CDA), because they contribute to think about the production of graffiti as texts, examine linguistic, imagery, sociocultural aspects, reflections on the pedagogy process present in graffiti, analyze the discursive plots of power in our patriarchal and Christian society. In graffiti collected in a school environment, we seek to identify and analyze yearnings, doubts, construction of masculinities and femininities, subjectivities as well as gender stigmas and prejudices. The results point out the need for reflection, discussion, visibility of this theme in the processes of professional and continuing teacher training, curricular inclusion, because due to the political and pedagogical interests in education, it invisibilized from its official documents as in the National Curricular Common Base questions of gender and of sexuality.