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Why do men marry and why do they stray?

Jeffrey Winking1, Hillard Kaplan, Michael Gurven

  • 1Department of Anthropology, University of New Mexico, Albuquerque, NM 87131, USA. jwinking@unm.edu

Proceedings. Biological Sciences
|April 26, 2007
PubMed
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Tsimane men

Area of Science:

  • Human Evolutionary Biology
  • Behavioral Ecology
  • Anthropology

Background:

  • Human reproduction often involves long-term pair bonds, culturally recognized as marriage.
  • Explanations for marriage in males include paternal investment (provisioning model) and monopolizing female fertility (mating effort model).

Purpose of the Study:

  • To test predictions of the provisioning and mating effort models by examining extramarital relationships.
  • To investigate the conditions influencing male infidelity in Tsimane forager-horticulturists.

Main Methods:

  • Analysis of data on men's extramarital sexual relationships among the Tsimane in Bolivia.
  • Testing whether infidelity correlates with opportunities for paternal investment or risks to fertility.

Related Experiment Videos

Main Results:

  • Tsimane men's extramarital affairs are more common when they are younger and have fewer children.
  • This timing supports the provisioning model, suggesting investment in offspring is a key factor.

Conclusions:

  • Male infidelity patterns among the Tsimane provide evidence supporting the provisioning model of marriage.
  • The timing of affairs suggests men prioritize investment in offspring over solely monopolizing fertility.