Extramarital sex occurs when a married person engages in sexual activity with someone other than their marriage partner. It is similar to adultery and may constitute infidelity where an unmarried but monogamous covenant is breached. This does not include fornication, which is sexual intercourse between non-married people, or a married man and a non-married woman.
Alfred Kinsey has found in his studies that 50% of males and 26% of females had extramarital sex. Depending on studies, it was estimated that 26-50% of men and 21-38% women, or 22.7% of men and 11.6% of women had extramarital sex. Other authors say that between 20% and 25% Americans had sex with someone other than their spouse. Durex’s Global Sex Survey has found that 44% of adults worldwide have had one-night extramarital sex and 22% have had an affair. But there were also studies that have shown rates of extramarital sex as low as 2.5%. As many authors say, this kind of estimates are probably understated because extramarital sex is commonly disapproved.
