Although the attachment theory is the most often applied in the study of parent-child relationships, it is also a highly significant theory in studying romantic relationships. Therefore, the aim of this paper is to present the basic tenets of the attachment theory and its influence on the quality of romantic relationships. The main findings of the attachment theory and its development path are presented at the beginning of the paper. Then, the focus is placed on the classification of attachment styles in childhood and the influence of each on the development of internal working models of self and others. Since the paper tries to bind the knowledge about attachment styles and the quality of young people's romantic relationships, extra importance is put on attachment styles in romantic relationships. As well as how each of those determines an individual's behavior in a partner relationship. Finally, relevant findings from various research on the quality of young people's romantic relationships concerning certain attachment styles of partners are presented, with specific emphasis on risky behaviors of young people, such as sexually risky behavior and alcohol and drug consumption.