Contributing Factors
Several factors may contribute to GSA. People commonly rank faces similar to their own as more attractive, trustworthy, etc. than average. Heredity produces substantial physical similarity between close relatives. However, Bereczkei (2004) attributes this in part to childhood imprinting on the opposite-sex parent. Shared interests and personality traits are commonly considered desirable in a mate. The heritability of these qualities is a matter of great debate; to whatever extent they are heritable, they will tend to cluster in close relatives. In cases of parent-child attraction, the parent may recognize traits of their own in the child and ultimately end up mating with them. Such reunions typically produce complex emotions in all involved.
Read more about this topic: Genetic Sexual Attraction
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