Similarity as a safe haven: Similarity leads to satisfaction in prevention focus

Despite its association with attraction and liking, similarity fails to reliably predict relationship satisfaction in marriage. This study suggests that individual differences in relationship regulatory focus, i.e., the motivation to prevent negative outcomes or promote positive outcomes in relationships, might address this inconsistency. Specifically, the comforting nature of similarity could potentially enhance marital satisfaction among relationship prevention-focused individuals by fostering a stronger interconnectedness with their partner, compared to relationship promotion-focused individuals. We tested this hypothesis using an online survey with 1,792 participants from Korea and 1,531 participants from the U.S. The results confirmed that relationship prevention-focused individuals experiencing higher self–partner similarity felt a stronger interconnectedness and, consequently, higher marital quality. However, self–partner similarity had a less pronounced effect on relationship promotion-focused individuals. These findings indicate that the perception of similarity plays a more significant role in the marriages of prevention-focused individuals.