Risk perception shapes individual behaviour, and is in turn shaped by the consequences of
that behaviour. Here we explore this dynamics in the context of human immunodeficiency
virus (HIV) spread. We construct a simplified agent-based model based on a partner
selection game, where individuals are paired with others in the population, and through a
decision tree, agree on unprotected sex, protected sex, or no sex. An individual's choice is
conditioned on their HIV status, their perceived population-level HIV prevalence, and the …