The HIV and STI burden in South Africa is one of the highest in the world. Many studies showed increased risk of HIV in those using alcohol (Fisher et al. 2007 and Shisana et al. 2009). Alcohol is also associated with HIV and sexual risk behaviours in several settings (Weiser et al. 2006, Thompson et al. 2005, etc.) We evaluated the associations between alcohol use measures and sexual risk behaviours in South Africa using national data.