“…Over the years, they have identified links between unprotected sex and, for example, an absence of illness symptoms (Skurnick et al 1998), greater HIV optimism (van de Ven et al 2005, the impact of an undetectable viral load on perceptions of infectivity (van de Ven et al 2005), duration of the relationship (Milam et al 2006), lower depression scores (Bradley et al 2008), lower education levels, unemployment and drug use (Buchacz et al 2001), lack of condom availability (Lau et al 2012), negative attitudes to condoms (Israel et al 2005), and refusal by male partners to use condoms (Semple et al 2002, Dave et al 2006, Milam et al 2006, Peretti-Watel et al 2006, Stevens and Galvao 2007. Some studies have also observed that HIV-negative partners tend to be the primary initiators of unprotected sex ( Van der Straten et al 1998, Kalichman 2000, Palmer and Bor 2001, and that repeated negative HIV tests for the uninfected partner reinforce a sense of low risk ( Van der Straten et al 1998, Persson and Richards 2008a, Reis and Gir 2009. Overall, the research findings are so mixed and contradictory that this, in itself, suggests that a range of complex factors are at play in serodiscordant relationships (Crepaz and Marks 2002), which in turn raises questions around how HIV 'risk' is defined and whether it means the same in all settings.…”