Abstract:The biological costs of inbreeding are expected to have shaped human incest aversion. These costs depend on biological sex, relatedness, and age. Whereas previous studies have focused on investigating how these factors modulate incest aversion in siblings and cousins—family members of the same generation—here we examined relatives of different generations. In a population-based sample, 2,499 respondents reported reactions to imagined sexual behaviors with either a biological child or parent, a niece/nephew or … Show more
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