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To provide a basis for a classification of sexual boundary violations online and a conceptualization of preventive measures, a systematic review of the literature on OSA involving webcams was conducted, resulting in publications from four thematic categories: webcam use in common OSA, psychopathological phenomena, sex work, and crime and indecency (commercial sexual exploitation, trafficking, and sexual boundary violations). The discussion addresses the implications of different types of sexual boundary violation of children and adolescents on the Internet. 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