... The honesty-humility domain of the HEXACO, in particular, models an individual's willingness to exploit others for personal gain and does so alongside five other interpersonally relevant domains of personality: emotionality, extraversion, agreeableness, conscientiousness, and openness to experience. These qualities are consequential to the formation, maintenance, and dissolution of romantic relationships (Brunell et al., 2010;Holden, Zeigler-Hill, Pham, & Shackelford, 2014;Kashdan et al., 2018;Wurst et al., 2017), and may afford situational advantages within a romantic relationship (see De Vries, Tybur, Pollet, & van Vugt, 2016;Lukaszewski, Gurven, von Rueden, & Schmitt, 2017). For instance, honest individuals (i.e., those who score higher on honesty-humility) are more likely to cooperate in the absence of punishment (Hilbig, Zettler, & Heydasch, 2012; also see Zhao & Smillie, 2015), are less likely to defect in prisoner dilemma games when the risk of defection has been lowered and the benefits of defecting are more tempting (Zettler, Hilbig, & Heydasch, 2013), use fewer cost-inflicting mate retention strategies (Holden et al., 2014), and are less likely to have committed romantic or sexual infidelity (Hilbig, Moshagen, & Zettler, 2015). ...