Unfaithful individuals are less likely to practice safer sex than openly nonmonogamous individuals.

Introduction: Given the prevalence and harm of sexually transmitted infections (STIs), there is a need to examine safer sex strategies in the context of romantic relationships and extradyadic sexual encounters. Sexual infidelity is associated with a variety of detrimental psychosocial outcomes; however, little research has addressed the sexual health ramifications of sexually unfaithful partners and members of other high-risk nonmonogamous lifestyles.

Aims: To determine whether sexually unfaithful individuals or "negotiated nonmonogamous" individuals are more likely to engage in sexual health risk reduction behaviors during extradyadic encounters and with their primary partner.