Sex differences in sequelae associated with levels of childhood physical mistreatment and verbal mistreatment were examined in a non-clinical sample of 272 university students. We predicted and found that both forms of mistreatment are related to attachment difficulties as well as various adverse psychological symptoms. We hypothesized, based on attachment theory, that the strength of a child’s attachment to one parent would moderate adverse emotional sequelae of mistreatment by the other parent. This prediction was only partially supported. Strength of the mother-daughter attachment moderated several of the adverse psychological symptoms in response to mistreatment by fathers, but mother-son attachment did not so moderate. Strength of the father-son attachment also did not moderate the symptoms associated with mistreatment perpetrated by mothers, nor did the father-daughter attachment. These results suggest that, among other relevant factors, sex differences should also be taken into account in treatment and prevention efforts.