Previous research in this field shows that partners choose one another on the basis of assortative mating when it comes to numerous characteristics. In doing so, their similarities may have effects on their relationship satisfaction. The aim of this study was to determine whether assortative mating correlated to professional interests and which particular mechanisms led to similarities. It was also examined if there were similarities in professional interests that influence relationship satisfaction. The study involved 215 dating couples aged between 19 and 65 who had been in a relationship for at least a year. The methodology consists of a questionnaire for self-assessment of professional interests and three indicators of relationship satisfaction – Perceived Relationship Quality Components, Satisfaction Index and Relationship Stability Scale. The results are gathered as a single variable, i.e. total relationship satisfaction. The research shows that there is a tendency of assortative mating based on professional interests. Furthermore, they match significantly more when compared to convergence. To be more precise, they are similar on the level of professional interests at the very beginning of a relationship, yet they do not get more similar as time passes. Similarly, they match more based on active initial assortment than on social homogamy, which means that they actively seek similar partners, and do not match on the basis of social background. Similarities in professional interests have no effect on relationship satisfaction, apart from the finding that women tend to be more satisfied with a relationship if their artistic professional interests are expressed similarly to those of their partners.