Over 75 percent of HIV infections are transmitted through sexual relations between women and men. In countries where young people account for a high proportion of all new infections, HIV-positive young women may outnumber their male peers by as much as six times. Therefore, addressing gender roles and power dynamics between women and men, and how they impact on sexual relations and decision-making, is critical for effective prevention to ultimately halt the HIV/AIDS pandemic. This is according to a UNFPA programme brief on gender and HIV/AIDS.