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Individual differences in personality and other traits may be associated with the likelihood that people or their partners will engage in infidelity. This chapter reviews research examining these possibilities. It begins by reviewing research examining associations between infidelity and (a) the Big Five, (b) Dark Triad, (c) attachment insecurity (i.e., attachment anxiety and attachment avoidance), and (d) sociosexual orientation. For each individual difference, it considers the extent to which each trait is associated with individuals’ own as well as their partners’ likelihood of engaging in infidelity. This chapter then outlines the importance of using strong methodologies to examine the association between personality and infidelity, including the importance of examining the role of both partners’ personalities and using strong measures of infidelity. This chapter concludes by highlighting important avenues for future …