> 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.

*Do individual differences in sociosexuality represent genetic or environmentally contingent strategies? Evidence from the Australian twin registry*. J. M. Bailey, K. M. Kirk, G. Zhu, M. P. Dunne, N. G. Martin J Pers Soc Psychol. 2000 Mar; 78(3): 537–545. From https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/10743879/citedby/?tool=pubmed

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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,

[screenshot](https://imgur.com/a/s1n40)

> 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

*Sexual infidelity in a national survey of American women: differences in prevalence and correlates as a function of method of assessment*. Mark A. Whisman, Douglas K. Snyder J Fam Psychol. 2007 Jun; 21(2): 147–154. doi: 10.1037/0893-3200.21.2.147 From https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/17605537/citedby/?tool=pubmed

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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.

*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)*. Lynn F. Cherkas, Elizabeth C. Oelsner, Y. T. Mak, Anna Valdes, Tim D. Spector Twin Res. 2004 Dec; 7(6): 649–658. doi: 10.1375/1369052042663922 From https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/15607016/citedby/?tool=pubmed

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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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[Female Infidelity Based on Number of Premarital Sex Partners -- Statistics Brain](http://archive.is/SDVEU)

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%