Do Humans Differentiate Social Roles? Trait Preferences in Friendship versus Romantic Relationships

Human relationships vary in structure and function. From an evolutionary perspective, friendships and romantic partnerships may have evolved to solve adaptive problems related to cooperation, investment, risk assessment, and reproduction (Conroy-Beam et al., 2015; Williams et al., 2022). Romantic partnerships are typically linked to mate selection and reproductive investment, emphasizing compatibility, commitment, and long-term resources. Friendships function as cooperative alliances that provide reciprocal support during uncertainty (Tooby & Cosmides, 1996). It remains unclear whether individuals systematically distinguish between relationship types when evaluating traits and behavior. This study investigates whether people prefer different traits in friends versus romantic partners and how these relationships are evaluated across contexts. We surveyed 127 U.S. students (18-22) on the trait preferences and scenario-based evaluations, predicting differences across relationship types.