It is often difficult to know what will 'work' when addressing upstream factors having an impact on the epidemic. Here is a document on what works addressing violence against women.

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Addressing violence against women and HIV/AIDS: What works?

There is a growing body of well-evaluated, promising programmes that should inform our work on VAW and HIV prevention. These interventions, summarized in the report, fall into various categories, but generally address: gender-equality interventions, including those that seek to empower women economically and through gender-equality awareness, and those working with communities and/or men and boys to challenge gender norms; comprehensive postrape care; those that address VAW in the context of HIV testing; and those focused on violence against sex workers.

http://whqlibdoc.who.int/publications/2010/9789241599863_eng.pdf