Employee strengths use has been found to be beneficial to employee and the employer organization. Yet, we have little knowledge on the antecedents to employee strengths use. participants (N = 241). Results indicate that psychopathy, narcissism and marital dissatisfaction are related to stronger tendencies towards infidelity, and that these effects are partially (in the case of psychopathy and marital dissatisfaction) or totally (in the case of narcissism) mediated by the tendency to morally justify unfaithful acts. No unique direct or indirect effect of Machiavellianism emerged as significant, while men were found to be more inclined towards unfaithful conduct. These findings highlight the importance of the skewed and self-lenient moral judgments fostered by the Dark Triad traits and marital dissatisfaction, which legitimize one?s infidelity and thus renders it more likely.