Effects of Rock and Water: an intervention to prevent sexual aggression

Sexual aggression among adolescents is a common problem which is related to lack of aggression regulation, positive or permissive attitudes towards sexual coercion, group pressure and inadequate communicative skills. Rock and Water is a psycho-physical intervention which addresses these issues. We conducted a quasi-experimental trial of Rock and Water in the Netherlands. In total, 521 boys aged 14–17 from nine pre-vocational education schools were included. The primary outcome variable was sexual aggression. Secondary outcomes were sexual interaction competence, self-regulation, attitudes towards dating violence, self-efficacy and self-esteem. Data were collected prior to the intervention, immediately after the intervention and five months after termination of the intervention. Boys reported a significant reduction in coercive strategies and particularly verbal manipulation (OR = .48). At follow-up, the boys reported a significant improvement in self-regulation and general self-efficacy (β = −.11, p < .05 and β = 1.02, p <.05, respectively). Rock and Water was effective in decreasing verbal manipulation and improving self-regulation and general self-efficacy.