 American researcher Alfred Kinsey found in his 1950-era studies that 50% of American males and 26% of females had extramarital sex.Depending on studies, it was estimated that 26–50% of men and 21–38% of women, or 22.7% of men and 11.6% of women had extramarital sex.Other authors say that between 20% and 25% of Americans had sex with someone other than their spouse.