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The logic of Ménage à Trois
M Enquist1, R H Rosenberg, H Temrin
1Department of Zoology, Stockholm University, Sweden. magnus@zool.su.se
Proceedings. Biological Sciences
|January 9, 1999
Summary
Female infidelity in socially monogamous species may not stem from seeking "good genes." Instead, a female
Area of Science:
- Evolutionary biology
- Animal behavior
- Game theory
Background:
- Socially monogamous species often exhibit female infidelity.
- Previous explanations focus on females seeking superior genetic partners ('Good Genes hypothesis').
Purpose of the Study:
- To propose an alternative evolutionary explanation for female infidelity.
- To investigate the role of female sexuality in regulating social behavior.
Main Methods:
- Development of a simple evolutionary game model.
- Analysis of a three-player game: male, female, and male lover.
Main Results:
- The model demonstrates that female infidelity can evolve.
- Solutions exist where females secure more male assistance by mating outside the pair bond.
- Female receptivity to multiple males can be a strategy to increase partner investment.
Conclusions:
- Female infidelity can be an adaptive strategy to enhance social support, not solely for genetic benefits.
- Female sexuality plays a crucial role in regulating social behavior and male assistance in evolutionary contexts.