Dark personality traits predict manipulation and aggression in romantic relationships

People with certain antagonistic personality traits frequently approach romantic partnerships with heightened levels of aggression, dominance, and a preference for unconventional sexual experiences. These same traits are connected to a higher likelihood of using manipulative tactics to coerce intimate partners into sexual activities. The research mapping out these behavioral patterns was published in the Journal of Sex & Marital Therapy.

In popular culture, the phrase toxic relationship is used to describe partnerships defined by controlling, manipulative, or emotionally abusive dynamics. Psychologists prefer to use specific, measurable concepts to understand why certain people routinely cultivate highly conflicted or damaging romantic bonds. One major area of focus is a constellation of personality profiles known as the Dark Triad.

The Dark Triad consists of three distinct but related personality traits: psychopathy, narcissism, and Machiavellianism. Psychopathy involves high impulsivity, a pronounced lack of empathy, and a tendency to behave antisocially. People with high levels of psychopathy struggle to form genuine emotional bonds. Narcissism is characterized by a grandiose sense of self-importance. Narcissistic individuals demand constant admiration and often react with hostility when they feel rejected or insulted.

Machiavellianism is named after the Renaissance political philosopher Niccolò Machiavelli. The trait centers on manipulating others to gain or maintain power. People with these traits view human nature cynically. They rely on deception and strategic planning to achieve their goals, treating interpersonal relationships as games to be won.

Psychologists also look through the lens of adult attachment theory to understand troubled romances. This theory suggests that humans develop an internal mental model of relationships during early childhood. This model persists into adulthood. People with secure attachment styles are comfortable with emotional intimacy and independence. Those with insecure attachment styles may cling anxiously to their partners or avoid emotional closeness altogether. Past research suggests that people who score highly on the Dark Triad measures often exhibit avoidant attachment styles, distancing themselves to maintain control or prevent vulnerability.

Building on this, researchers observe a phenomenon known as the relationship personality. This concept posits that individuals display a relatively stable cluster of behaviors uniquely reserved for intimate partners, distinct from how they interact with friends or colleagues. People tend to seek out partners who respond to their specific relationship personality. This habit often leads individuals to repeatedly select similar types of romantic partners despite negative past experiences.

Researchers Judith Antonia Iffland, Lara Katharina Albrecht, and Urszula Martyniuk of the Medical School Hamburg in Germany wanted to see how the Dark Triad traits translate into specific relationship expectations. They aim to bring scientific rigor to the popular concept of toxicity. They designed a study to systematically evaluate whether psychopathy, narcissism, and Machiavellianism forecast aggressive, dominant, and sexually coercive behaviors in intimate relationships.

The research team recruited 624 adult participants for an online survey. The participant group included 481 women and 143 men, with an average age in their late twenties.

Participants answered a standard psychological questionnaire designed to assess their levels of psychopathy, narcissism, and Machiavellianism. The survey asked them to rate their agreement with statements reflecting manipulative or emotionally callous attitudes.

Next, the researchers evaluated the participants using a relationship and attachment personality inventory. This tool measures the specific attitudes and behaviors people exhibit toward their romantic partners. The inventory included questions about their tendencies for dominance and aggression, such as whether they respond to provocation with physical strikes. It also measured their need for emotional closeness and their preferences for adventurous, risky, or deviant sexual activities.

A final segment of the survey asked participants about their experiences with sexual aggression. They were asked whether they had ever used physical force, verbal pressure, or a partner’s inability to resist to coerce a romantic partner into a sexual act. They were identically asked if they had ever experienced these coercive tactics from a partner.

The data revealed a robust link between the Dark Triad traits and a highly aggressive approach to romance. Individuals scoring higher on these traits were substantially more likely to report a relationship style defined by physical aggression, rudeness, and a tendency to provoke fights.

Among the three traits, psychopathy proved to be the strongest predictor of this combative and dominant relationship style. Because psychopathy includes elements of impulsivity and decreased behavioral control, the researchers noted that it makes sense for it to map closely onto aggressive relationship dynamics.

The personality traits were also connected to distinct sexual expectations. Participants with higher Dark Triad scores expressed a stronger preference for passionate, adventurous, and sometimes risky sexual activities. Psychopathy again emerged as a strong predictor in this category. The researchers suggested that the emotional detachment associated with psychopathy might drive a preference for superficial or purely physical sexual gratification over tender romance.

When looking at emotional dependency, the traits diverged. Machiavellianism was positively correlated with an anxious need for closeness. People elevated in Machiavellian traits reported higher separation distress and a stronger desire to merge with their partners. The researchers theorize that this need for proximity might actually be a strategy to monitor and control their partners, reflecting an underlying mistrust rather than genuine affection.

The researchers then analyzed the data on sexual coercion within intimate partnerships. They found that individuals harboring these dark traits were more likely to act as perpetrators of sexual aggression. Specifically, Machiavellianism was the trait most reliably associated with the perpetration of sexual coercion.

The strategic thinking and lack of empathy common in Machiavellianism may lead people to use subtle manipulation to initiate sex. Such coercive strategies might include issuing false promises, creating guilt trips, or leveraging a position of power. The researchers noted that these individuals frequently try to maintain dominance in social interactions, which unfortunately extends into the bedroom.

The survey data also highlighted an overlap between the perpetrators and targets of sexual aggression. The vast majority of the respondents who admitted to using coercive sexual strategies also claimed to have been targets of sexual aggression by a partner. The researchers hypothesized that people high in manipulative traits might perceive situations as coercive more quickly or might feel psychologically manipulated themselves due to a fragile need for control.

Men in the sample scored higher on the Dark Triad scales than women did, mirroring patterns seen in the broader psychological literature. Men also reported higher levels of adventurous sexual desires. The statistical models indicated that the fundamental association between the personality traits and aggressive relationship behaviors was broadly similar for both men and women.

The authors noted a few limitations regarding the research design. The study relied on cross-sectional survey data, meaning the researchers captured a single snapshot in time. They cannot prove that these personality traits definitively cause the abusive behaviors, only that they are strongly correlated.

The phrasing used to recruit participants might have also introduced a specific bias. The study advertisement featured the term toxic relationships, which likely attracted an unusual number of people with troubled romantic histories. An exceptionally high percentage of the female respondents reported experiencing sexual victimization from a partner. The researchers acknowledge that these rates do not reflect the general population and indicate a self-selection bias among the survey takers.

In addition, the reliance on self-reporting means that parts of the data might be subject to a social desirability bias. People generally hesitate to admit to socially unacceptable or illegal behaviors. Because individuals with high Dark Triad traits are prone to deceit, they might have downplayed the true extent of their coercive or manipulative actions.

For future sociological work, the researchers recommend assessing both members of a couple simultaneously. Studying partners together would help scientists understand how these challenging personality traits interact with a mate’s characteristics to influence relationship stability and conflict over time. Developing a better understanding of how manipulation and coercion operate in these relationships may eventually improve risk assessment tools and counseling strategies to prevent interpersonal violence.

The study, “The Dark Triad and Relationship Expectations: Attempting an Empirical Approach to Study Toxic Relationships,” was authored by Judith Antonia Iffland, Lara Katharina Albrecht, and Urszula Martyniuk.