The aim of this study was to examine the connection between romantic relationships and the components of the Dark Triad of personality, the influence of gender and the type of romantic relationship in that connection, as well as the correlation of the characteristic of the Dark Triad within the partners. In the research, 143 couples of heterosexual orientation were involved, of which 62 couples are in a relationship, and 81 couples in a marital or extramarital community. The participants completed the Short Dark Triad Scale, the Relationship Assessment Scale and Demographics Questionnaire. The results indicated the existence of a connection between the satisfaction in the romantic relationship and the expression of the components of the Dark Triad, but only for women and that, if the satisfaction of one partner is growing, the satisfaction of the other partner increases too. Furthermore, the connection between romantic relationships and the Dark Triad on the samples of the different relationship status also proved to be significant in a way that, with partners in a relationship the expression of the Dark Triad traits, is related with pleasure, but only in men, while with married couples, the expression of the Dark Triad traits also proved to be related to pleasure, but only in women. As far as the gender differences goes, men are more expressive on all three sublists of the Dark Triad: Machiavellianism, narcissism and psychopathy, The relationship between the components of the Dark Triad with the couples also proved to be significant in a way that couples choose people who are similar to themselves.