This study aimed to assess whom adolescents shared information and dialogues about sexuality with. Therefore, 383 fifteen to nineteen year-old adolescents enrolled in a family health unit in the city of São Paulo (Brazil) were interviewed in 2002. Adolescents most frequently seemed to talk about sex with peers, although they lost priority according to the complexity of the theme. Thus, teachers and health professionals were mainly indicated as a reference when talking about std/aids. For 20% of the adolescents, parents were the main persons to get information from, no matter the subject. The results indicated that this entire social and family network should be incorporated as partners in sexual and reproductive health promotion among adolescents.