Marital or relationship dissatisfaction can be caused by psychological abuse or aggression. In a 2007 study, Laurent et al. report that psychological aggression in young couples is associated with decreased satisfaction for both partners: "psychological aggression may serve as an impediment to couples' development because it reflects less mature coercive tactics and an inability to balance self/other needs effectively." In a 2008 study on relationship dissatisfaction in adolescents Walsh and Shulman explain, "The more psychologically aggressive females were, the less satisfied were both partners. The unique importance of males' behavior was found in the form of withdrawal, a less mature conflict negotiation strategy. Males' withdrawal during joint discussions predicted increased satisfaction."