A thought experiment was developed in which it is demonstrated that frequently recurring temptations are hard to resist even if the risks of succumbing to the temptation are well understood. Behavioural programmes against AIDS are primarily concerned with making the risks of unprotected sex known to groups of people at risk of contracting HIV. But these target groups are also shown to engage in very frequent sex and this, combined with the thought experiment suggest that behavioural programmes may be less effective than desired. Structural interventions may be more successful than behavioural programmes. Some limitations of the thought experiment are considered.
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