Background: Interpersonal relationships, especially intimate partnerships, play a crucial role in the quality of life during early adulthood. The Dark Triad of personality, which encompasses socially undesirable traits, may negatively affect relationship stability and sexual satisfaction.
Aim: The aim of the study was to assess the relationships between Dark Triad personality traits and sexual satisfaction as well as quality of life among young adults, and to examine differences in these variables across groups distinguished by selected sociodemographic characteristics.
Participants: The study included 262 individuals, comprising 191 women and 71 men.
Methods: The research consists of a sociodemographic questionnaire and standardized psychological instruments with established psychometric properties: the Dirty Dozen Scale, the Sexual Satisfaction Questionnaire (KSS), and the World Health Organization Quality of Life Questionnaire (WHOQOL-Bref).
Statistical analyses: Spearman’s rank correlation coefficient, Kruskal–Wallis test, and Mann–Whitney U test were used.
Results: A positive, statistically significant but weak correlation was found between narcissism and quality of life in the domain of physical well-being. Psychopathy and Machiavellianism were negatively and weakly correlated with social well-being. Furthermore, weak negative associations were observed between psychopathy and sexual satisfaction, as well as between Machiavellianism and the sense of intimacy.
Conclusions: Higher levels of narcissism may be positively associated with quality of life in the domain of physical well-being. Machiavellianism may be negatively associated with intimacy and social well-being, while psychopathy may be negatively related to both social well-being and sexual satisfaction.