At the micro level, it becomes important to understand the links between risk behaviours and cognitive, affective and behavioural factors in the individual at the time of the event. What makes the person drink before having sex? What happens to the risk perception? What kinds of sexual encounters is one likely to engage in? What happens to the likelihood of and the ability to use condoms under the influence of alcohol in a given individual? What is the likelihood of STI/HIV transmission? Are appropriate steps taken by the individual towards primary or secondary prevention?