The paper is focused on the role of the sexual motivation in committing violent crimes.

Target of this report is to assess the eventual change of the phenomenology of the violent crime for reason of sex the last years which are characterized, in western countries, from a large liberalization of the sexual habits. In particular, on the basis of the available figures, we would like to evaluate the phenomenon and its long time trends from a social point view.

From a psychological and criminological points of view, we evaluate the actual characteristics of some crimes associated with the individualʼs behaviour and sexual drives. In this perspective, we try to analyze the motivation of the serial killer and of the other monstrous offenders due to their sexual mental desires.

In this work, we take into account the role of the paraphilies, of the drug abuse, of the pornography, and finally of the effect of the mass media transmitted violence on the dynamics and genetics of the violent behaviour today.