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Extramarital sex occurs when a married person engages in sexual activity with someone other than his or her spouse. From a different perspective, it also applies to a single person having sex with a married person. Engagement in extramarital sex has been associated with individuals who have a higher libido (sex drive) than their partner.〔1997, Vulnerability to HIV infection and effects of AIDS in Africa and Asia/India - Page 47, James Ntozi〕 Where extramarital sexual relations breach a sexual norm, it may also be referred to as ''adultery'', ''fornication'', ''philandery'', or ''infidelity.'' These terms may also carry moral or religious consequences in civil or religious law. ==Prevalence== American researcher Alfred Kinsey found in his 1950-era studies that 50% of American males and 26% of females had extramarital sex. 〔The Kinsey Institute. ''(Data from Alfred Kinsey's Studies )''. Published online.〕 Depending on studies, it was estimated that 26-50% of men and 21-38% of women,〔Choi, K.H., Catania, J.A., & Dolcini, M.M. (1994). (Extramarital sex and HIV risk behavior among U.S. adults: Results from the national AIDS behavioral survey ). ''American Journal of Public Health, 84, 12,'' pp. 2003-2007.〕 or 22.7% of men and 11.6% of women had extramarital sex.〔Wiederman,M.W. (1997). (Extramarital sex: prevalence and correlates in a national survey ). ''Journal of Sex Research, 34, 2,'' pp. 167–175.〕 Other authors say that between 20% and 25% Americans had sex with someone other than their spouse.〔Atkins, D.C., Baucom, D.H. and Jacobson, N.S. (2001). (Understanding Infidelity: Correlates in a National Random Sample ). ''Journal of Family Psychology, 15, 4,'' pp. 735-749〕 Durex's Global Sex Survey has found that 44% of adults worldwide have had one-night extramarital sex and 22% have had an affair.〔Durex. (The Global Sex Survey 2005 ). Published online.〕 According to a 2004 United States survey,〔 Short Analysis (here )〕 16% of married partners have had extramarital sex, nearly twice as many men as women, while an additional 30% have fantasized about extramarital sex. There were also studies that have shown rates of extramarital sex as low as 2.5%.〔 As many authors conclude, these kinds of estimates are probably understated because extramarital sex is commonly disapproved of. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「extramarital sex」の詳細全文を読む スポンサード リンク
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