Coolidge effect
The Coolidge effect describes a phenomenon in which male animals (and potentially humans) experience renewed sexual interest when presented with a new, receptive partner, even after having recently engaged in sexual activity with another partner. This renewed interest is often associated with the introduction of sexual novelty and can lead to increased mating behavior.
Men favor sexual variety more than women
But women show interest when every potential partner is highly attractive.
Psychologists use the Coolidge effect, the idea that males seek sexual novelty, to explain why men usually say they want more partners than women. A new experiment put this idea to the test with a large mixed-gender group who played a dating-app style game. Participants could distribute ten hypothetical encounters among potential partners in any way they liked.
Key findings:
- Men chose variety. Most men spread their ten choices across many partners, confirming the Coolidge effect.
- Women usually stuck to one or two partners, yet when every man in the line-up was rated highly attractive, women also pursued several partners.
- Age mattered for men. Older men expressed an even stronger wish for variety and became less selective about looks, while still preferring youth.
The authors link these patterns to evolutionary mating strategies: men’s potential reproductive payoff from multiple partners is high, whereas women normally gain more by selecting just a few high-quality mates, unless all options seem equally attractive and short term.
Taken together, the study supports the view that desire for multiple partners is stronger in men, but it also shows that women’s choices shift when circumstances change.
“Experimental Evidence for Sex Differences in Sexual Variety Preferences: Support for the Coolidge Effect in Humans” – Journal & Date: Archives of Sexual Behavior, Volume 50, Issue 2, February 2021
Two experiments show that men consistently prefer a larger number of short-term partners than women. Women’s interest rises only when all male options are equally attractive. The authors conclude that preference for sexual variety is an evolved, sex-specific mating strategy.
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