High (in)fidelity: gender, the Dark Tetrad, and infidelity

Infidelity is a common problem in intimate relationships and is often a main contributor to relationship breakdowns. The aim of the current study was to extend the infidelity literature by differentiating between physical, emotional, and malevolent forms of infidelity, and exploring individual differences (i.e., gender and The Dark Tetrad of personality) that are associated with perpetration in these forms. The sample comprised 240 participants aged 18 to 67 years (Mage = 29.41 years, SD = 10.32; 76.8% women). People with higher psychopathy were more likely to engage in all forms of infidelity. High narcissism was predictive of emotional infidelity, and high sadism was predictive of malevolent infidelity. Interestingly, gender was only predictive of malevolent infidelity, with women more likely than men to perpetrate this form of infidelity. Exploratory analyses indicated that many of the associations between Dark Tetrad and infidelity were moderated by gender. Results of the current study may support researchers and therapists in differentiating between different types of infidelity (i.e., emotional, physical, malevolent). Further, these findings may contribute to the development of screening tools for therapists working who provide support for infidelity in intimate relationships.