Through an empirical study, D. Paulina Matyjas examines the quality of attachment as a psychological factor influencing various aspects of monogamous and non-monogamous partnership models. The author expands the discourse on alternative relationship concepts with this study by incorporating a personality psychology perspective. D. Paulina Matyjas demonstrates that the extent of fear of loss and avoidance of intimacy in a partnership varies with personal affinity for one of the two relationship concepts, the level of partnership satisfaction in both relationship models, and the intrapersonal reaction to consensual sexual outside contacts of the partner.