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The present research investigates the role of dark and light personality traits in determining academic discipline preferences among university students. Two studies showed that university students with relatively high scores on dark personality traits (specifically, narcissism and Machiavellianism) and relatively low scores on light personality traits are over-represented in business and law programs, compared to psychology and other academic disciplines. The results further suggest that personality is a distal determinant of academic discipline choice, with human values being the proximal determinant. Specifically, high scores in dark/low light personalities express a desire for power, which explains why they choose economics or law as their academic discipline. Contrary to our expectations, low dark/high light personalities were not over-represented in psychology, compared to other academic disciplines. Overall, our findings highlight the importance of considering personality traits and human values in understanding academic discipline choices among university students. Recognizing these factors can inform educational institutions in developing strategies to better support students in aligning their academic pursuits with their personal characteristics and values.

Online aggression is a form of antisocial online behavior that has been widely studied among adolescents, but adults of all ages are involved as well. The goal of the present study is to broaden the understanding of potential risk factors of online aggression perpetration. Associations between socially aversive personality traits and online aggression are examined. In contrast to previous research and to account for ICT affordances, the present study argues for and tests the mediating role of online moral disengagement, and not traditional moral disengagement, in the relationships between traits and perpetration. To this aim, a cross-sectional dataset, balanced in terms of age, was collected among 2,000 adults aged 19–79. A path model revealed indirect associations for two traits, psychopathy and sadism, with online aggression perpetration via online moral disengagement, while controlling for online aggression victimization. Theoretical and practical implications are discussed.

The Short Dark Tetrad (SD4) was developed as a brief measure of the Dark Tetrad, which comprises narcissism, Machiavellianism, psychopathy, and sadism. Previous research suggests the possibility of cultural differences in these traits in Western and Eastern cultures. We developed and validated the Chinese form of SD4 (C-SD4) cross four studies in a large sample (total N = 3181) to assist in solving problems caused by these differences. In study 1, we adjusted the item pool on the basis of the original form of SD4. In Study 2, we trimmed the scale to generate a 28-item version of C-SD4 and examined correlations with Big-5. In study 3, we examined the internal structure, measurement invariance, and criterion validity of the C-SD4. In study 4 we examined C-SD4 test-retest reliability and compared item content to standard measures. This package of studies suggests that the C-SD4 is a reliable and valid measure of the Dark Tetrad in Chinese participants.

Recent research has shown that a tendency to harm others goes hand in hand with a tendency to harm oneself. The present two studies further supported the notion that the joy of harming others and oneself has a common core by showing positive relationships between dark personality traits (particularly psychopathy) and sexual masochistic preferences and between general masochistic tendencies and sexual sadistic preferences. Despite the overlap between dark personality traits and general masochistic tendencies, they independently predicted the engagement in sexual sadomasochism. These relationships statistically held when controlling for the impact of basic personality (Study 1). Study 2 found that self-enhancement, openness to change, and low conservation values serve as motivators for a person's attraction to sexual sadomasochism and shed some light on the differences between sexual sadomasochism and the Dark Tetrad. Overall, people who score relatively high on dark personalities and masochism are particularly predisposed to engage in sexual sadomasochism, in both the dominant and the submissive roles.

The present research examined whether the Dark Tetrad facets—narcissism, Machiavellianism, psychopathy, and everyday sadism—are predictive of engagement in athletic aggression. In Study 1, participants (N = 603) received a list of 46 sport activities and were asked to assess the level of aggressiveness of the sport activity they participate in most intensively. They also provided self-reports of the Dark Tetrad. As predicted, athletic aggression was positively related to all facets of the Dark Tetrad. Multiple regression analyses showed that psychopathy had the most robust association with the engagement in athletic aggression. Study 2 (N = 208) showed that differences in the endorsement of self-transcendence values (benevolence and universalism) accounted for the relationships between Machiavellianism and psychopathy and athletic aggression. As also predicted, most of the Dark Tetrad scales were positively related to self-enhancing values (achievement and power). However, because self-enhancing values were not related to athletic aggression, they did not account for the relationship between the Dark Tetrad and engagement in athletic aggression. Overall, it appears that people who score relatively high on antagonistic personality traits tend to care little about the well-being of other people and therefore have little hesitation in harming others in their sporting activities.

There has been an absence of consideration regarding measurement invariance across males and females in the widely available Dark Tetrad (DT) scales which measure psychopathy, Machiavellianism, narcissism and everyday sadism. This has resulted in criticisms of the measures, suggesting that the assessed constructs are not wholly relatable between the groups. This article documents the construction and validation of the Dark Side of Humanity Scale (DSHS), which measures dark personalities from an alternative viewpoint, determined by the constructs as they emerged from the male and female data, whilst aligning with theory and attaining invariance between sex. Across four samples (n = 2409), using a diverse range of statistical methods, including exploratory graph analysis, item response theory and confirmatory factor analysis, a divergence from the widely available DT measures emerged, whereby primary psychopathy and Machiavellianism were unified. This corroborated past research which had discussed the two constructs as being parallel. It further supported the DSHS with a shift away from the traditional DT conceptualisation. The resulting scale encompasses four factors which are sex invariant across samples and time. The first factor represents the successful psychopath, factor two addresses the grandiose form of entitlement, factor three taps into everyday sadism whilst the fourth factor pertains to narcissistic entitlement rage. Construct and external validity of the DSHS across two samples (n = 1338), as well as test-retest reliability (n = 413), was achieved. The DSHS provides an alternative approach to investigating the dark side of human nature, whilst also being sex invariant, thus making it highly suitable for use with mixed sex samples.

The present study explored links between male Dark Tetrad personality traits (psychopathy, Machiavellianism, narcissism, sadism) and preferences for using outdoor and indoor female sex worker services. We also investigated the mediating effects of perceiving sex workers as deviant and as victims. Heterosexual males (N = 347) were recruited to take part in an online survey investigating personality and attitudes towards female sex workers. Path analyses revealed that psychopathy and sadism positively predicted preferences for outdoor but not indoor female sex services. Sex worker choice mediated positive links between narcissism and outdoor female sex worker preferences. Compared to indoor, outdoor sex services are associated with increased aggression and violence. Our findings highlight the importance of considering narcissism and particularly psychopathy and sadism when investigating individual male preferences for outdoor sex services that are being offered by particularly vulnerable women.