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.
Based on research, it was estimated that 26 to 50 percent of men and 21 to 38 percent of women, or 22.7 percent of men and 11.6 percent of women had extramarital sex. Other researchers have reported that between 20% and 25% of Americans engaged in sexual activity outside their marriage.