Infidelity is defined as engaging in emotional or sexual relationships outside the agreed boundaries of a relationship, but there are significant differences in which behaviors individuals perceive as cheating. The purpose of the research was to determine how students in Slovenia and Belgium comparatively perceive cheating and whether there are differences between the countries by behavior group – sexual, emotional, online or independent behaviors. We examined whether Slovenian and Belgian students differ in their attitudes towards cheating and whether there is a connection between the dark triad and positive attitudes towards cheating. We were interested in whether positive attitudes towards cheating and the dark triad are positive predictors of cheating and upgraded the results with a mediation model. In the research, we used online questionnaires, which we translated into Slovenian for the purposes of the research. 413 students participated (208 Belgian and 205 Slovenian). We found that Belgian and Slovenian students most unanimously perceive sexual behaviors as cheating. This was followed by online, emotional and finally independent behaviours. Slovenian students rated slightly less than half of the presented behaviours higher than Belgian students. Belgian students expressed greater acceptance of cheating, but at the same time they condemned it more strongly than Slovenian students. We found that individuals in both samples with higher psychopathy and machiavellianism traits had a more positive view of cheating. We also found that more positive attitudes towards infidelity predicted cheating. In both samples, we found that psychopathy is a positive predictor of cheating, while machiavellianism is a negative one. In the Slovenian sample, positive attitudes towards cheating were a key factor through which the dark triad traits affected behaviour. Our research provides important starting points for research on cheating in a cross-cultural environment and the role of personality traits and attitudes. However, many aspects of cheating remain unexplored and leave many open questions that could be examined in further studies.
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