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In a Swiss study of 5,175 young adults around age 26, 5.3% were still virgins. Men had 2.27 times the adjusted odds of being virgins compared with women. The most common reason reported by male virgins was that they had “not had the occasion” to have sex (47%), while female virgins most commonly said they had “not found the right person” (46%). The second most common reasons were “not found the right person” for men (19%) and “waiting until marriage” for women (19%).

Grass is green.

Smith & Wolfinger used longitudinal Add Health data, following people from adolescence into adulthood and marriage. In the detailed sample of about 3,500 people those with 9+ premarital sexual partners had about 3.2× the adjusted odds of marital dissolution compared with those with none.

The results persisted even after controlling for 20 different factors including age at marriage, education, religiosity, family background, premarital cohabitation, age at first sex, depression, and attitudes toward premarital sex.

The 9+ partner result was highly statistically significant (p < .001) and did not significantly differ between men and women.

Klusmann surveyed 1,865 German students in stable heterosexual relationships lasting from under six months to over fifteen years. He found that the longer the relationship the less desire a women has for frequent sex. The share of women saying they want to have frequent sex fell from 68% in the shortest relationships to just 22% in relationships over six years. In contrast, men desire for sex stayed constant no matter the length of the relationship at around 75%.

Even when age, living situation, marital status, children, past partners, and attitudes are held constant, women’s sexual desire still plummets and neither habituation, routine, commitment imbalance, nor gender norms can explain it.

Klusmann used evolutionary psychology to explain that after the honeymoon phase. Women’s biology shifts from intense sexual drive toward nurturing the relationship. In contrast, men’s drive stays strong, as regular intercourse helped protect their paternity.