Abstract
The aim of the article is to investigate the thesis of a direct and indirect link between sex, gender, and aggressive and victim behavior from the perspective of bio–, social and psychological development. The meta-analysis of the previous study identifies risk factors and protective factors for becoming an aggressor or a victim and the role of sex and gender in that process. The work consists of two parts. The first part of the chapter is the review of the latest research in the field of aggression and adolescence focused on conditions of violence among youth. And the second part is the presentation of the latest research of the author. In the study, model were considered: bio, psycho and social factors such as sex, temperament; attachment; aggressiveness; family, teacher, and classmate support; resilience; and the previous victim or aggressor experiences