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It’s Not Just Lunch: Extra-Pair Commensality Can Trigger Sexual Jealousy

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  • Kevin M Kniffin
  • Brian Wansink

Abstract

Do people believe that sharing food might involve sharing more than just food? To investigate this, participants were asked to rate how jealous they (Study 1) – or their best friend (Study 2) – would be if their current romantic partner were contacted by an ex-romantic partner and subsequently engaged in an array of food- and drink-based activities. We consistently find – across both men and women – that meals elicit more jealousy than face-to-face interactions that do not involve eating, such as having coffee. These findings suggest that people generally presume that sharing a meal enhances cooperation. In the context of romantic pairs, we find that participants are attuned to relationship risks that extra-pair commensality can present. For romantic partners left out of a meal, we find a common view that lunch, for example, is not “just lunch.”

Suggested Citation

  • Kevin M Kniffin & Brian Wansink, 2012. "It’s Not Just Lunch: Extra-Pair Commensality Can Trigger Sexual Jealousy," PLOS ONE, Public Library of Science, vol. 7(7), pages 1-4, July.
    • Handle: RePEc:plo:pone00:0040445
    DOI: 10.1371/journal.pone.0040445
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    References listed on IDEAS

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    1. Joseph Henrich & Steve J. Heine & Ara Norenzayan, 2010. "The Weirdest People in the World?," RatSWD Working Papers 139, German Data Forum (RatSWD).
    2. Kevin Kniffin, 2009. "Evolutionary perspectives on salary dispersion within firms," Journal of Bioeconomics, Springer, vol. 11(1), pages 23-42, April.
    3. Peter DeScioli & Robert Kurzban, 2009. "The Alliance Hypothesis for Human Friendship," PLOS ONE, Public Library of Science, vol. 4(6), pages 1-8, June.
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    Cited by:

    1. Kevin M. Kniffin & Brian Wansink, 2013. "Death Row Confessions and the Last Meal Test of Innocence," Laws, MDPI, vol. 3(1), pages 1-11, December.

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