The failing internalization of norms in men sentenced for sexual crimes is the issue under consideration in this paper. According to George Kelly’s Personal construct Theory, norms can be regarded as constructions built on previous experience. Such constructs are the means that enables the individual to anticipate future events and makes the person act in accordance with the societal norm system. This constructivist perspective on thinking underpins the research undertaken. The method approach used encompassed interviews, where personal constructs with regard to important people in the participants’ lives were elicited. The method provided tools to find channels to the thoughts that may explain their criminal behaviour. This paper presents the constructs elicited from the different grid responses. The interpretations of the constructs are being analyzed and discussed. The need for psychological treatment among sexual offenders is much more extensive than the treatment currently provided by the Swedish Prison and Probation Administration. For obvious reasons, research has mainly focused on the victims. The situation and the problems of the perpetrators are known, but they have not been thoroughly discussed, and not in the light of Kelly’s Personal construct Theory. A constructivist treatment programme, in order to change the thoughts and attitudes of these offenders, could form part of the rehabilitation treatment offered. In addition, the focusing on the importance of early internalization of societal norms and on the implications of different forms of neglect in childhood may help to prevent crimes.