Thesis (Ph.D.) - Indiana University, Department of Psychological and Brain Sciences and the Cognitive Science Program, 2019Humans are a fundamentally social species, and an individual may have social ties of many flavors. One social domain, mate or romantic partner choice, has been thoroughly examined, but others remain relatively understudied. How do our choice patterns vary between different social domains? In this work, I argue that although choice constraints vary between social domains (e.g. a collaborator, spouse, friend, mentor, or dodgeball teammate), the fundamental patterns of choice are ultimately similar. In this dissertation, I present studies of three different choice areas. First, I compare the search for non-social resources such as food (i.e. Optimal Foraging Theory; OFT) with that for a romantic partner to produce a theory-driven framework for mate choice as a foraging problem. Mate foragers demonstrated sensitivity to search costs as predicted by OFT, where those searching longest for their first marriage (but not cohabitations) had a decreased risk of relationship dissolution. However, periods of relationships and search also covaried in ways unexpected by OFT. Next, I tested for the presence of two common patterns in romantic partner choice: positive assortment (e.g. homophily) and the stated-revealed preference gap (inconsistency between one’s stated preferences and the actual traits of a chosen partner). I demonstrated these patterns in two social domains: academic collaborator choice and companion animal choice. I tested whether homophily was the best predictor of academic collaborations forming. I held three academic speed-networking events, a modified form of speed-dating. Pairs were assigned experimentally based on the similarity of academics’ current research and complementarity of desired vs current knowledge. These manipulations did not significantly impact collaboration rates; rather, believing a partner’s research was similar was predictive of collaboration, suggesting homophily has a nuanced role in collaboration formation. I then examined dog choice in animal shelters. Comparing the traits of a newly adopted dog to the stated preferences of their adopter, adopters perceived their dog to fulfill their stated preferences at above-chance rates. These adopter-dog pairs also exhibited weak positive assortment of personality. I summarize the implications of exapting choice mechanisms which are appropriate for one adaptive domain to novel social domains with different choice constraints.