Prior research has shown a strong correlation between HIV infection and a history of intimate partner violence, particularly among young women. However, the role violence plays in the sexual relationships of young people in Sub-Saharan Africa is not well understood. This study in Tanzania, published in the December 4 edition of International Family Planning Perspectives, concludes that the association between HIV and violence identified among young people in prior research may be partially explained by their experiences with infidelity and forced sex in their intimate partnerships. HIV prevention interventions that fail to take into account the infidelity, violence and forced sex frequently involved in youth's sexual relationships will have a limited impact.