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Related Experiment Videos

Evolution of human serial pairbonding.

H E Fisher1

  • 1Department of Anthropology, American Museum of Natural History, New York, New York 10024.

American Journal of Physical Anthropology
|March 1, 1989
PubMed
Summary
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Divorce consistently peaks around the fourth year of marriage across diverse cultures, particularly for couples with fewer children. This pattern suggests an evolved reproductive strategy for hominid infant survival.

Area of Science:

  • Anthropology
  • Sociology
  • Evolutionary Biology

Background:

  • Divorce patterns exhibit cross-cultural consistency, irrespective of divorce rates.
  • Societal data from 1947-1981 reveal a distinct divorce distribution.
  • Divorce risk is highest during peak reproductive and parenting years.

Purpose of the Study:

  • To analyze the consistent patterns of divorce across diverse societies.
  • To investigate the relationship between divorce timing, age, and number of children.
  • To propose an evolutionary explanation for observed divorce patterns.

Main Methods:

  • Analysis of United Nations Demographic Yearbook data (1947-1981) for 58 populations.
  • Examination of divorce data from horticultural and gathering/hunting societies.

Related Experiment Videos

  • Cross-cultural comparison of divorce timing, age-specific risk, and family size.

    • Main Results:

    • Divorces consistently peak around the fourth year of marriage, followed by a long decline.
    • Divorce risk is highest for males aged 25-29 and females aged 20-29.
    • Divorce counts are highest among couples with two or fewer children.
    • Similar divorce timing is observed in both industrialized and traditional societies.

    Conclusions:

    • The modal four-year marriage duration at divorce reflects an evolved hominid reproductive strategy.
    • This strategy likely ensured infant survival through weaning, linked to increased female reproductive burden.
    • Serial pairbonding, common cross-culturally, may stem from ancestral adaptive advantages.