Violence against women poses an enduring social challenge, taking diverse forms and inflicting harm, often with long-lasting or lethal consequences. ^{Reference White, Sin, Sweeney, Salisbury, Wahlich and Montesinos Guevara1} Sexually aggressive behaviour does not emerge in a vacuum but is deeply rooted in the surrounding social context. Perceptions of cultural norms, gender and sexual roles are therefore likely to play a role in defining interpersonal violence and the circumstances under which it can be considered ‘legitimate’. Cultural stereotypes are crucial in shaping expectations of acceptable behaviour for men and women. ^{Reference Stewart, Wright, Smith, Roberts and Russell2} These stereotypes often ascribe inherent characteristics to women, labelling them as either ‘good’ (chaste, nurturing or pure) or ‘bad’ (promiscuous, hostile or seductive), and are closely linked to patriarchy-enhancing ideologies that disregard women’s rights. ^{Reference Bareket, Kahalon, Shnabel and Glick3} These evaluative logics operate within historical regimes of patriarchy that delimit women’s sexual and relational agency, producing normative ideals of modesty, passivity and docility as disciplinary techniques that regulate femininity. ^{Reference Balint4} Simultaneously, heteronormative structures function as a matrix of intelligibility that naturalises heterosexuality and binary gender, assigning moral value to women’s sexual conduct and enacting social sanctions to deviations from prescribed norms. ^{Reference Ferrari, Imperato and Mancini5} Through their mutual reinforcement, these systems consolidate gendered hierarchies that authorise men to surveil, discipline and punish women who do not conform to normative feminine sexual boundaries. Within this sociocultural and discursive field, patriarchal and heteronormative norms have historically inscribed women into positions of sexual restraint and relational subordination while positioning men as entitled subjects endowed with authority and sexual prerogative. ^{Reference Rodríguez-García-de-Cortázar, González-Calo and Gómez-Bueno6} These prescriptions operate as cultural scripts that both produce and constrain sexual subjectivities, stigmatising perceived departures from feminine respectability and sustaining relational power orders that legitimise men’s regulatory and punitive power over women’s choices.

Interestingly, studies suggest that personality plays a role in explaining differences in behavioural patterns and beliefs on interpersonal relationships and gender-based violence. ^{Reference Joo, Yeon and Lee7} Of specific interest in this context are the Dark Triad personality traits. ^{Reference Paulhus8} The Dark Triad refers to a cluster of three personality traits (i.e. Machiavellianism, narcissism and psychopathy), which share characteristics related to manipulation, grandiosity, deceitfulness and callousness. ^{Reference Paulhus8} Particularly, those who are high on Machiavellianism are especially likely to be emotionally detached and manipulative, while being high on narcissism is predominantly characterised by grandiosity and dominance. Finally, psychopathy is characterised by being high on insensitivity, cynicism and impulsivity. The Dark Triad has subsequently incorporated sadism (i.e. the pleasure arising from the physical or emotional suffering of others) in configuring what is referred to as the Dark Tetrad. ^{Reference Paulhus8}

Not surprisingly, these subclinical traits are considered salient in a range of antisocial behaviours, even in intimate settings. ^{Reference Figueredo, Gladden, Sisco, Patch and Jones9} For example, individuals with high Dark Triad traits tend to display inappropriate reactions in interpersonal contexts. ^{Reference Wai and Tiliopoulos10} These reactions often include cold-heartedness, a diminished commitment to justice and less condemnation of deviant behaviour, which can undermine prosocial tendencies and lead to a reluctance to intervene in moral situations. ^{Reference Takamatsu and Takai11} Furthermore, when these traits intersect with a person’s sexual scripts (i.e. the expectations for how women and men interact in courtship and intimate relationships), ^{Reference Ward, Rosenscruggs and Aguinaldo12} they contribute to attitudes and beliefs that may facilitate sexual assault, such as victim-blaming and rape myth endorsement. ^{Reference Jonason, Girgis and Milne-Home13,Reference Brewer, Lyons, Perry and O’Brien14} In fact, the degree in which people believe in common rape myths has been found to be related to adherence to gender stereotypes about women. ^{Reference Costin and Schwarz15} Such beliefs, albeit factually incorrect, are widely endorsed at multiple levels of society. Notably, this endorsement, which is particularly evident in men, is associated with lower empathy towards victims (i.e. the ability to infer, understand and share in the emotional experiences of others), which in turn has been consistently identified as a common characteristic of individuals with Dark Tetrad personality traits. ^{Reference Heym, Firth, Kibowski, Sumich, Egan and Bloxsom16}

Building on this evidence, recent research has increasingly focused on the role of reduced empathy as a psychological mechanism through which Dark personality traits translate into aggression and tolerance of sexual violence. Diminished empathic abilities have been empirically shown to link Dark Triad or Tetrad traits with increased aggression, victim-blaming and reduced moral inhibition: for example, research ^{Reference Heym, Firth, Kibowski, Sumich, Egan and Bloxsom16} found that impaired cognitive and affective empathy partially mediated the relationship between psychopathy and indirect relational aggression. More specifically, in contexts of interpersonal and sexual violence, lower empathy has been found to promote endorsement of deviant sexual attitudes and diminish concern for victims, thereby functioning as a psychological mechanism connecting Dark personality traits to socially harmful behaviours. Recent work ^{Reference Basharpoor, Noori, Daneshvar and Jobson17} supports that empathy operates as a mediator of the effect of Dark personality traits on cyber- and interpersonal aggression. Some studies have found that individuals perceived as Machiavellians or psychopaths are more likely to be viewed as engaging in sexual harassment, ^{Reference Pavlović, Markotić and Bartolin18} especially by those who themselves exhibit higher levels of Machiavellianism and a proclivity for sexual harassment. Additionally, psychopathy has been linked to a greater likelihood of victim-blaming and a reduced tendency to hold perpetrators accountable in cases of sexual harassment. ^{Reference Brewer, Lyons, Perry and O’Brien14} A more recent study ^{Reference Chung, Chen and Syed Faisal Al-Edros19} also revealed a positive relationship between Machiavellianism and narcissism and the perceived responsibility of victims in cases of stalking. In this study, narcissistic individuals were more likely to dismiss harassing behaviour as non-stalking, while those with higher levels of psychopathy were less inclined to see the need for police intervention. Similarly, individuals with high levels of sadism were less likely to recognise the potential for causing distress or fear. ^{Reference Chung, Chen and Syed Faisal Al-Edros19} Analogous results were found in relation to hands-off abuse, with sadism being the strongest predictor of online sexual victimisation, psychopathy for revenge porn propensity and narcissism for psychological intimate partner violence perpetration. ^{Reference Pineda, Martínez-Martínez, Galán, Rico-Bordera and Piqueras20}

Other studies have shown relationships between Machiavellianism, sadism, disinhibition, lack of perspective-taking and indulgent attitudes towards abuse. ^{Reference Longpré, Moreton, Snow, Kiszel and Fitzsimons21} Looking at the broader sociocultural context, research ^{Reference Costa, Fávero, Moreira, Del Campo and Sousa-Gomes22} also pointed to a link between acceptance of ideologies that affirm male supremacy over women (e.g. sexism, machismo and hypermasculinity), Dark Tetrad traits and tolerance of sexual violence.

In an attempt to deepen the understanding of the psychological pathways behind advocacy of violence against women, this study aimed to examine the relationship between Dark Tetrad personalities and vindictive rape (i.e. a vengeful and punitive response to perceived sexual transgressions) in non-incarcerated, community-based individuals. Specifically, the present study examined whether empathy could serve as a mediator between these study variables. Based on the conceptual framework and the literature review, the following hypotheses were proposed:

• H1: There is a significant relationship between Dark Tetrad traits, empathy and attitudes supportive of vindictive rape.

• H2: Attitudes supportive of vindictive rape are negatively correlated with empathy and positively correlated with Dark Tetrad traits.

• H3: Empathy is negatively correlated with Dark Tetrad traits.

• H4: Empathy mediates the relationship between Dark Tetrad traits and attitudes supportive of vindictive rape.

Method

Participants

Participants were 1548 individuals recruited from the general Italian population, including 1037 females (67.3%) and 503 males (32.7%). Most of them were of Italian nationality (n = 1530; 98.8%) and aged from 18 to 83 (M _age = 36.94; s.d._age = 15.72). Table 1 shows more details about participants’ sociodemographic characteristics.

Table 1 Sociodemographic characteristics

a. Preferred not to disclose in eight cases.

Procedure

Data were collected from 1 July 2023 to 31 October 2023 through an anonymous online survey hosted on Google Forms. To reach a broader sociodemographic sample, we employed a snowball sampling strategy, starting by recruiting participants from major social networking sites and then encouraging them to share the survey link with their own networks. Exclusion criteria were defined, including age below 18 years, education level below 5 years, low Italian language proficiency and the presence of severe psychiatric and/or neurological disorders, which were determined by a yes/no self-report item. Only participants with complete data on all the outcome measures were retained. This process led to a final sample of 1548 individuals. All procedures contributing to this work comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2013. All procedures involving human subjects were approved by the University of Turin Ethics Committee (protocol reference number 0289029). Participants were assured of data confidentiality and were informed that participation in the study was voluntary and unpaid. Written informed consent was obtained from all of them.

Instruments

Sociodemographic and clinical information

Participants were asked to provide the following sociodemographic and clinical information: age, gender, educational level, nationality, occupation, marital status and the presence or history of psychiatric-neurological disorders (used as inclusion/exclusion criteria).

The Dark Triad Dirty Dozen (DTDD)

The Italian validated version of the DTDD ^{Reference Jonason and Webster23,Reference Schimmenti, Jonason, Passanisi, La Marca, Di Dio and Gervasi24} is a self-report questionnaire comprising 12 items designed to measure the three Dark Triad traits. Participants were instructed to indicate their agreement on a scale ranging from 0 (Strongly disagree) to 4 (Strongly agree) with statements such as: ‘I tend to manipulate others to get my way’ (reflecting Machiavellianism), ‘I tend to lack remorse’ (indicating psychopathy) and ‘I tend to want others to admire me’ (representing narcissism).

The scale has demonstrated good or acceptable internal consistency in this study (Machiavellianism: α = 0.86; psychopathy: α = 0.70; narcissism: α = 0.82).

The Short Sadistic Impulse Scale (SSIS)

The Italian adaptation of the SSIS ^{Reference O’Meara, Davies and Hammond25} is a 10-item self-report scale aimed at evaluating sadistic tendencies at a subclinical level (i.e. indirect manifestations of sadism). The instrument was adapted into Italian following internationally accepted guidelines for cross-cultural scale translation. First, two independent bilingual researchers translated the original English items into Italian (forward translation). These two versions were compared and reconciled into a single provisional Italian version. Subsequently, a separate bilingual translator, blind to the original scale, back-translated the instrument into English (back-translation). The back-translation was then checked against the original items to ensure conceptual and semantic equivalence. Discrepancies were discussed and resolved by the translation team, and minor linguistic adjustments were made to preserve the meaning and tone of the original scale.

Participants rated the extent to which they agreed with each statement on a 5-point Likert-type scale ranging from 1 (Not at all like me) to 5 (Very like me). Examples of the SSIS items include ‘I have fantasies which involve hurting people’ and ‘I have humiliated others to keep them in line’. The sum of all the items’ ratings was computed as the final score, with higher scores reflecting greater sadistic inclinations. In the current research, the reliability was good (α = 0.80).

The Basic Empathy Scale (BES)

The Italian validated version of the BES ^{Reference Jolliffe and Farrington26,Reference Albiero, Matricardi and Toso27} comprises 20 items, each scored on a scale from 1 (Strongly disagree) to 5 (Strongly agree). The items are categorised into two factors: cognitive empathy and affective empathy. Nine items comprise the cognitive subscale, for which some examples are the following: ‘I find it hard to know when my friends are frightened’ and ‘I can often understand how people are feeling even before they tell me’. Meanwhile, the affective subscale, comprising 11 items, includes statements like ‘Seeing a person who has been angered has no impact on my feelings’ and ‘I don’t experience sadness when I witness others crying’. Total scores on the scale range from 20 (indicating a deficit in empathy) to 100 (reflecting a high level of empathy). In our sample, Cronbach’s α value was good for the BES total score (α = 0.86).

Vindictive Rape Attitude Questionnaire (VRAQ)

The Italian validated version of the VRAQ ^{Reference Hanson28,Reference D’Urso, Petruccelli, Grilli and Pace29} was used to assess the agreement to a form of retributive justice where the perpetrator punishes the female victim for perceived violations of sexual norms. Participants were asked to answer each of the 15 items (e.g. ‘If a woman cheats on her husband, I would have no sympathy if she gets raped.’) on a 5-point scale (with scores ranging from 1 = completely disagree to 5 = completely agree). Higher scores indicate stronger support of vindictive rape. In the current sample, the Cronbach’s α coefficient was 0.82.

Data analysis

Statistical analyses were conducted using SPSS version 29.0 for Windows (IBM, Armonk, New York, USA). Normal distribution was assessed using the indices of asymmetry and kurtosis, which confirmed that all variables had a normal distribution. Descriptive data were calculated for the entire sample to obtain an overview of the sociodemographic and psychological characteristics of the participants. Descriptive data were presented as means with s.d. for continuous variables or as frequencies with percentages for categorical variables. Participants who failed to complete all study measures were automatically excluded from the data-set, resulting in a final sample with no missing data.

First, Pearson correlation analyses were conducted to assess the presence of significant associations between the target variables (e.g. Dark Tetrad personality traits, empathy and attitudes supportive of vindictive rape). Second, PROCESS macro 4 for SPSS (model type 4) was used to test the mediating role of empathy in the association between Dark Tetrad personality traits (as independent variables) and attitudes supportive of vindictive rape (as the dependent variable), controlling for the effect of gender. ^{Reference Hayes30} Only those variables with significant correlations with the dependent variable were included in the following mediation models. The bootstrap sample size was 5000, and if the value of zero was not within the 95% confidence interval, the mediating effect was considered significant.

Results

Correlation analyses

Bivariate correlations, score ranges, means and s.d. for the study variables are presented in Table 2.

Table 2 Bivariate correlations for the study variables

***p < .001.

Mediation analyses

A set of three mediation models was employed to examine the effect of Dark Tetrad personality traits on attitudes supportive of vindictive rape as mediated by empathy, controlling for the gender of the participants.

Effects of Machiavellianism on attitudes supportive of vindictive rape through empathy

The first mediation analysis (Fig. 1) was conducted to examine whether the BES total score mediates the relationship between the Machiavellianism subscale of the DTDD and the VRAQ. The results indicated that there was no significant direct effect of Machiavellianism on VRAQ (b = 0.109, β = 0.046, p = 0.073). However, a significant indirect effect of Machiavellianism on VRAQ through the BES total score was observed (b = 0.035, β = 0.015, bias-corrected and accelerated (BCA) CI (0.013, 0.063)). This suggests that higher levels of Machiavellianism are associated with stronger support for vindictive rape, indirectly through lower levels of empathy. The indirect pathway accounted for approximately 37% of the total explained variance in the model.

Fig. 1 Model of Machiavellianism as a predictor of attitudes supportive of vindictive rape, mediated by empathy. The confidence interval for the indirect effect is a bias-corrected and accelerated bootstrapped confidence interval based on 5000 samples.

Effects of psychopathy on attitudes supportive of vindictive rape through empathy

The second mediation analysis (Fig. 2) was conducted to examine the effect of the BES total score in mediating the association between the psychopathy subscale of the DTDD and the VRAQ. Results showed a significant indirect effect of psychopathy on the VRAQ through the BES total score (b = 0.103, β = 0.044, BCa CI (0.058, 0.153). In contrast, no evidence was found that psychopathy had a direct effect on attitudes supporting vindictive rape (b = −0.009, β = −0.004, p = 0.882). The indirect pathway explained approximately 39% of the variance attributable to the model.

Fig. 2 Model of psychopathy as a predictor of attitudes supportive of vindictive rape, mediated by empathy. The confidence interval for the indirect effect is a bias-corrected and accelerated bootstrapped confidence interval based on 5000 samples.

Effects of sadism on attitudes supportive of vindictive rape through empathy

In the third mediation model (Fig. 3), sadism was significantly directly related to attitudes supporting vindictive rape (b = 0.250, β = 0.180, p < 0.001). When assessing the indirect path, the positive association between sadistic traits and support for vindictive rape through empathy (b = 0.028, β = 0.020, BCa CI = (0.012–0.046)) was significant. The indirect pathway accounted for approximately 15% of the total explained variance in the model.

Fig. 3 Model of sadism as a predictor of attitudes supportive of vindictive rape, mediated by empathy. The confidence interval for the indirect effect is a bias-corrected and accelerated bootstrapped confidence interval based on 5000 samples.