Young adults have to make important fitness-related decisions regarding how they will invest their time and energy into parenting, mating, and somatic investments. Using an adaptive, evolutionary lens, we examined the role of personality traits on the appeal of, and engagement with, these 3 forms of investment. We also examined the potential indirect role of appeal in linking personality to engagement. We chose to study 516 young adults whose life stage coincides with compromises between these 3 forms of investment. Our data showed that certain HEXACO traits were uniquely associated with parenting (e.g., higher E, X, and lower C), mating (e.g., lower H, higher X, lower C, and higher O), or somatic (e.g., lower H, higher E, X, A, and C) appeal and engagement. Additionally, some traits that were associated with parenting engagement were also related to somatic appeal. In contrast, some traits that were associated with parenting engagement were inversely related to mating appeal and viceversa. Our study therefore depicts the flexibility of personality traits in their associations with investment decisions. This malleability in personality traits could allow for investment decisions that could lead to adaptive outcomes across different contexts.
Public Significance StatementPersonality traits can play a significant role in delineating individuals' important life decisions, such as parenting, mating, and establishing oneself. Our study showed that specific personality traits relate to how individuals perceive these decisions, which can then be associated with engagement in 1 or more of these important decisions. This study provides some important insight into how personality is linked with potentially adaptive decisions individuals make regarding their time and resources.