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Why her history matters

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> Factors found to facilitate infidelity

>> Number of sex partners: Greater number of sex partners before marriage predicts infidelity

> As might be expected, attitudes toward infidelity specifically, permissive attitudes toward sex more generally and a greater willingness to have casual sex and to engage in sex without closeness, commitment or love are also reliably related to infidelity

Fincham, F. D., & May, R. W. . Infidelity in romantic relationships. Current opinion in psychology, 13, 70–74. />
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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

Haselton, M. G., Buss, D. M., Oubaid, V., & Angleitner, A. . Sex, Lies, and Strategic Interference: The Psychology of Deception Between the Sexes. Personality and Social Psychology Bulletin, 31 , 3–23. />
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> Men apparently assess and evaluate levels of sexual activity by a woman prior to long-term commitment—behavior that would have been observable or known through social reputation in the small-group lifestyles of our ancestors. Past behavior is a good predictor of future behavior, and having a large number of sex partners prior to marriage is a statistical predictor of infidelity after marriage

Buss, D. M., & Schmitt, D. P. . Mate Preferences and Their Behavioral Manifestations. In Annual Review of Psychology . Annual Reviews. />
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> it would appear that the premaritally experienced females were more inclined to accept coitus with males other than their husbands after marriage.

Kinsey, A. C., Pomeroy, W. B., Martin, C. E., & Gebhard, P. H. . Sexual behavior in the human female. Saunders. />
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> 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

Whisman, M. A., & Snyder, D. K. . 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 , 147–154. />
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> Generally speaking, respondents who report extensive premarital sexual experience report extensive extramarital activity. Measures of the locus of first intercourse and number of premarital partners show positive associations with rating one’s marriage as less happy than average, the number of different extramarital partners, and the intention to participate in mate-swapping activities

Athanasiou, R., & Sarkin, R. . Premarital sexual behavior and postmarital adjustment. Archives of Sexual Behavior, 3 , 207–225. />
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> promiscuity is in fact a good predictor of infidelity. Indeed, promiscuity among females accounted for almost twice as much variance in infidelity as it did for males .

Hughes, S. M., & Gallup, G. G., Jr. . Sex differences in morphological predictors of sexual behavior: Shoulder to hip and waist to hip ratios. Evolution and Human Behavior, 24 , 173–178. 00149-6

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> Sexual promiscuity was significantly positively correlated with emotional promiscuity , as well with sexual infidelity and emotional infidelity

Pinto, R., & Arantes, J. . The Relationship between Sexual and Emotional Promiscuity and Infidelity. Athens Journal of Social Sciences, 4 , 385–398. />
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> Each additional sex partner between age 18 and the first union increased the net odds of infidelity by 1%

Treas, J., & Giesen, D. . Sexual Infidelity Among Married and Cohabiting Americans. Journal of Marriage and Family, 62 , 48–60. />
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> A preliminary ANOVA analysis revealed that individuals reporting a past history of infidelity tended to have a greater number of past sexual partners than those without a history of infidelity , F = 52.16, p < .001, d = .81.

Barta, W. D., & Kiene, S. M. . Motivations for infidelity in heterosexual dating couples: The roles of gender, personality differences, and sociosexual orientation. Journal of Social and Personal Relationships, 22 , 339–360. />
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> Subjects reporting sex with men other than their husbands while they were married were significantly younger at first intercourse

Essock-Vitale, S. M., & McGuire, M. T. . Women’s lives viewed from an evolutionary perspective: I. Sexual histories, reproductive success, and demographic characteristics of a random sample of American women. Ethology & Sociobiology, 6 , 137–154. 90027-5

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> A central purpose of this research was to identify correlates of betrayal. In addition to attitudes toward betrayal, a number of other factors were found to be associated with acts of betrayal. As predicted, such factors as sexual permissiveness, an avoidant romantic style, number of romantic relationships, and early onset of sexual intercourse were all correlated with a higher incidence of betrayal behaviors. These factors are likely to promote sexual activity with a larger number of partners, which, in turn, increases the chance that betrayal will occur.

Feldman, S. S., & Cauffman, E. . Your cheatin’ heart: Attitudes, behaviors, and correlates of sexual betrayal in late adolescents. Journal of Research on Adolescence, 9 , 227–252. />
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> Multivariate model fitting to infidelity and number of sexual partners confirmed that a Cholesky model containing parameters for additive genetic factors and the unique environment, but without shared environmental factors, provided the best explanation of the observed correlation between the two variables. The resulting genetic correlation between the two traits was .47, so nearly half the genes impacting on infidelity also affect number of sexual partners.

Cherkas, L., Oelsner, E., Mak, Y., Valdes, A., & Spector, T. . 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 . Twin Research, 7 , 649-658. />
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> The residents of Promiscuous America are predictable in many ways. They’re less likely to be married and more likely to be divorced. They’re several times as likely as their less adventurous peers to have cheated on a spouse.

Wolfinger, N. H. . Promiscuous America: Smart, secular, and somewhat less happy. Institute for Family Studies. Retrieved December 13, 2021, from

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> As it relates to sexual history later in life, promiscuity is linked to a higher likelihood of cheating in long-term, serious relationships. Vrangalova thinks the reason may be that many promiscuous people aren’t really built for monogamy.

Kubota, T. . What the number of sexual partners says about you. Men’s Journal. Retrieved December 3, 2021, from

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> When compared with their peers who report fewer partners, those who self-report 20 or more in their lifetime are:

>> Three times as likely to have cheated while married

Regnerus, M. . Cheap sex: The transformation of men, marriage, and monogamy.

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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. . 10 Predictors of Infidelity and Gender Differences: Why Do Partners Cheat?. Psych Central. Retrieved on July 15, 2020, from

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> An indicator of whether or not the respondent has had previous sex partners is included and identifies the number of male sex partners the woman had previous to her relationship with her current primary partner… A history of numerous sex partners indicates a pattern or habit of sexual behavior that we expect will negatively influence sexual exclusivity in the current relationship.

> Having previous sexual partners greatly increased the likelihood that a woman
would have a secondary sex partner. In particular, a woman with 4 or more male sex partners prior to her primary relationship was about 8.5 times more likely to have a secondary sex partnerthan a woman with no previous sex partners… Having previous sex partners also increased the likelihood that dating and married women would have secondary sex partners. In particular, married women with 4 or more previous partners were 20 times more likely to have secondary sex partners than married women with no previous sex partners

Forste, R., & Tanfer, K. . Sexual Exclusivity among Dating, Cohabiting, and Married Women. In Journal of Marriage and the Family . JSTOR. https://doi.org/10.2307/353375