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Strauss and Gelles factors in partner abuse risk among cohabiting couples
Isolation - Couples who are living together and not married might be socially isolated.
Autonomy and control - When the issue of control arises, violence may occur. As the relationship becomes more serious, the issue of control may become more important.
Investment in the relationship - Cohabiting couples may share some characteristics that trigger violence while lacking others shared by married couples that stop the conflict from escalating into physical violence.