Final answer:
Physical attraction is important but not the only factor that matters in relationships; traits like intimacy, commitment, similarity, and benefits outweighing the costs are also crucial according to Sternberg's Triangular Theory of Love and Social Exchange Theory.
Step-by-step explanation:
Physical attraction matters in relationships for many reasons, but it is not the sole determinant of whether a relationship will form or be maintained. While physical attraction can spark initial interest and is certainly an aspect of the passion component in Sternberg's Triangular Theory of Love, it does not alone sustain a relationship. Other key factors such as intimacy, which involves sharing, caring, and emotional support, and commitment, which includes the decision to remain with another person and work towards shared goals, are just as important in the long-term satisfaction and success of relationships. Additionally, the matching hypothesis suggests that people tend to pair up with others who are roughly equal in attractiveness and social desirability.
Another important consideration comes from the notion of similarity in relationships. We are often attracted to and form bonds with others who share our background, attitudes, and lifestyle since sharing common interests facilitates easier interaction and connection. Finally, the Social Exchange Theory postulates that the benefits of a relationship must outweigh or balance the costs for it to continue. Research across various disciplines, such as the seminal work of Festinger, Schachler, and Back, or the findings from Hosoda, Stone-Romero, and Coats regarding the impact of physical attractiveness, support the multifaceted nature of relationship dynamics.