Given the plural society in which we live, where different options of identification in the hierarchies of belonging, how are the questions of sexuality represented for adolescents in High School? Are there mechanisms of heteronormativity inserted in social relations, more specifically, in school relations? How does the school education deal the discrimination, prejudice and violence directed against sexualities? If in existence, which political and pedagogical directives act in this scenario? This dissertation sets itself to be an analysis of if and how homophobia is present in school daily life, in search to understand (1) how adolescents in High School of a public school of Rio de Janeiro acknowledge sexual diversity and homophobia, (2) the occurrence of an appreciation for heterosexuality and (3) how sexual diversity is experienced and discussed in school activities. For such, a qualitative research was chosen, through two instruments: focal groups and semi-structured interviews, conducted with 14 students. This way, it confirmed a concordance with the existence of homophobia was observed in the speeches of the adolescents addressed, lived even inside the school, as well a affirmation that this thematic is not inserted in pedagogical activities in and outside the classroom. Associated to this, it was also perceived the articulation of some intercultural questions to a proposal of teaching that values sexual diversity. The goal being to debate the relevance of a non-homophobic education, turned to Basic Education.