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approximately half of women in the top quintiles of sociosexuality had been sexually unfaithful to a steady partner; this was more than a tenfold increase over the corresponding rate for people in the bottom quintiles.

Bailey, J. M., Kirk, K. M., Zhu, G., Dunne, M. P., & Martin, N. G. (2000). Do individual differences in sociosexuality represent genetic or environmentally contingent strategies? Evidence from the Australian twin registry. Journal of personality and social psychology, 78(3), 537–545. https://doi.org/10.1037//0022-3514.78.3.537

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In illustration of this, the odds ratio of 1.13 for lifetime sexual partners obtained with the face-to-face mode of interview indicates that the probability of infidelity increased by 13% for every additional lifetime sexual partner,

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Regarding the correlates of infidelity, results indicated that on the basis of both methods of assessment, the probability of sexual infidelity increased with higher number of lifetime sexual partners

Whisman, M. A., & Snyder, D. K. (2007). Sexual infidelity in a national survey of American women: Differences in prevalence and correlates as a function of method of assessment. Journal of Family Psychology, 21(2), 147–154. https://doi.org/10.1037/0893-3200.21.2.147

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Our findings demonstrate that infidelity and number of sexual partners are both under moderate genetic influence (41% and 38% heritable, respectively) and the genetic correlation between these two traits is strong (47%). The resulting genetic correlation between the two traits was .47, so nearly half the genes impacting on infidelity also affect number of sexual partners. The correlation of the unique environment between the two variables was .48.

Cherkas, L., Oelsner, E., Mak, Y., Valdes, A., & Spector, T. (2004). Genetic Influences on Female Infidelity and Number of Sexual Partners in Humans: A Linkage and Association Study of the Role of the Vasopressin Receptor Gene (AVPR1A). Twin Research, 7(6), 649-658. doi:10.1375/twin.7.6.649

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A truism in psychology is that the best predictor of future behavior is past behavior. This is no less true in the realm of sexual behavior. Indeed, one of the strongest predictors of marital infidelity is one’s number of prior sex partners (Buss, 2000). Deception about past sexual promiscuity would have inflicted greater costs, on average, on men than on women

Haselton, M. G., Buss, D. M., Oubaid, V., & Angleitner, A. (2005). Sex, Lies, and Strategic Interference: The Psychology of Deception Between the Sexes. Personality and Social Psychology Bulletin, 31(1), 3–23. https://doi.org/10.1177/0146167204271303

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Sexual promiscuity was significantly positively correlated with emotional promiscuity [r(356) = .261, p < .001], as well with sexual infidelity [r(323) = .595, p < .001] and emotional infidelity [r(323) = .676, p < .001], indicating that sexually promiscuous participants also tend to be emotionally promiscuous, and sexual[ly] and emotional[ly] unfaithful. In terms of the sexual domain, results showed that there is also a positive correlation between sexual promiscuity and sexual infidelity, stating that individuals that tend to be more sexually promiscuous also tend to be more sexually unfaithful. These results support our second hypothesis.

Pinto R., Arantes J. (2016). The Relationship between Sexual and Emotional Promiscuity and Infidelity in Proceedings of the Athens: ATINER’S Conference Paper Series, No: PSY2016-2087, Athens, 10.30958/ajss.4-4-3

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Number of pre-marital partners: percent who cheated once married

  • 2: 10.4%
  • 3: 14.9%
  • 4: 17.7%
  • 5: 21.6%
  • 6-10: 26.0%
  • 11-20: 36.7%
  • 21+: 46.8%

NORC General Social Survey. (2011, October 02). Female Infidelity Based on Number of Premarital Partners — Statistic Brain. Retrieved July 5, 2015, from http://www.statisticbrain.com/percent-of-female-infidelity-based-on-number-of-premarital-partners/

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Contrary to the myth, partners who’ve had many partners have a harder, not easier, time remaining monogamous. They are significantly more at risk of straying than those with little or no prior sexual experience.

Staik, A., PhD. (2019, March 28). 10 Predictors of Infidelity and Gender Differences: Why Do Partners Cheat? Retrieved July 15, 2020, from https://blogs.psychcentral.com/relationships/2014/08/a-look-at-infidelity-why-do-partners-cheat/

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For people in this survey who reported four or fewer lifetime sexual partners, the rate of infidelity in the current marriage dropped to 11%, while for those who had five or more sexual partners the number was nearly double (21%). The break between the 54% of people who had five or more lifetime sexual partners vs. the 46% who had four or fewer total partners illustrates the lessons from the study. This breakpoint is validated by the fact that when asked straight out, 68% of those with more sexual partners in their pasts agreed that, “I am always faithful to my sexual partner” (whether currently married or single), compared to 82% of those with fewer sexual partners who said the same.

[I]nfidelity is also often the fruit of a lifelong approach to mating that involves seeking and practicing short-term mating encounters that encourage sexual variety at all stages and into marriage.

McQuivey, J. L., PhD. (2019, October 14). The Road to Infidelity Passes Through Multiple Sexual Partners. Retrieved July 16, 2020, from https://ifstudies.org/blog/the-road-to-infidelity-passes-through-multiple-sexual-partners-