Intergenerational incest aversion: self-reported sexual arousal and disgust to hypothetical sexual contact with family members

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Kresanov P, Kotler J, Seto M, Lieberman D, Santtila P, Antfolk J
Publication year: 2018
Journal: Evolution and Human Behavior
Journal acronym: EVOL HUM BEHAV
Volume number: 39
Issue number: 6
Start page: 664
End page: 674
Number of pages: 11
ISSN: 1090-5138


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- we examined relatives of different generations. In a population-based sample, 2499 respondents reported reactions to imagined sexual behaviors with either a biological child or parent, a niece/nephew or aunt/uncle, or a stepchild or stepparent; these responses were compared to reactions to imagined sexual behaviors involving a friend's child or parent. Replicating prior results, women report stronger incest aversions than do men. We extend previous findings by showing that incest aversions tended to be stronger between close (vs. more distant) intergenerational relatives. Indeed, for biological relatives, decreased degree of relatedness was associated with decreased incest aversion, and for biological relatives, the certainty in relatedness was also positively associated with incest aversion. As expected, age modulated sexual aversion for unrelated, but not related, target individuals. Sexual aversions towards step-relatives did not differ from sexual aversions to biological relatives.


Disgust, Inbreeding, Incest aversion, sexual abuse, Sexual arousal


Last updated on 2020-21-09 at 06:26

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