| http://www.w3.org/ns/prov#value | - According to Tom Smith, the director of the Center for the Study of Politics and Society, as quoted by Forbes in 2009: ???The best estimates are that about 3 percent to 4 percent of currently married people have a sexual partner besides their spouse in a given year and about 15 percent to 18 percent of ever-married people have had a sexual partner other than their spouse while married.??? Extramar
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