Self-resemblance has been found to have a context-dependent effect when expressing preferences for faces. Whereas dissimilarity preference during mate choice in animals is often explained as an evolutionary adaptation to increase heterozygosity of offspring, self-resemblance can be also favored in humans, reflecting, e.g., preference for kinship cues. We performed two studies, using transformations of facial photographs to manipulate levels of resemblance with the rater, to examine the influence of self-resemblance in single vs. coupled individuals. Raters assessed facial attractiveness of other-sex (...) and same-sex photographs according to both short-term and long-term relationship contexts. We found a preference for dissimilarity of other-sex and same-sex faces in single individuals, but no effect of self-resemblance in coupled raters. No effect of sex of participant or short-term vs. long-term attractiveness rating was observed. The results support the evolutionary interpretation that dissimilarity of other-sex faces is preferred by uncoupled individuals as an adaptive mechanism to avoid inbreeding. In contrast, lower dissimilarity preference of other-sex faces in coupled individuals may reflect suppressed attention to attractiveness cues in potential alternative partners as a relationship maintenance mechanism, and its substitution by attention to cues of kinship and psychological similarity connected with greater likelihood of prosocial behavior acquisition from such persons. (shrink)

The target meta-analysis raises a number of red flags for research on menstrual shifts in women’s psychology. In this commentary, I particularly address one: the near-absent attention to sociocultural forces in this body of work. I use social neuroendocrinology as one example of a research paradigm that integrates both evolution and socialization into studies of human behavior. I argue that incorporating attention to social constructions actually provides clearer answers to evolutionary questions and also fills the biobehavioral comparative mandate by seriously (...) attending to human specificities alongside cross-species generalities. I close by noting that human bodies simultaneously reflect evolved and sociocultural forces, an understanding that undergirds contemporary biobehavioral research. (shrink)