Increasing sexual frequency in a regular relationship from once a month to once a week delivers a happiness boost equivalent to the happiness gain from a roughly $50,000 annual salary raise.

The happiness-maximizing number of sexual partners in the previous year was calculated as one. Zero partners or multiple partners both correlated with LOWER happiness than monogamous frequency with a single partner.

Higher family income had essentially zero correlation with sexual frequency or number of partners. Rich and poor Americans reported very similar sex lives. (This was one of the findings that surprised the researchers.)

Typical American frequency was modest. The median person had sex 2–3 times a month. About 25% reported no sex in the previous year (higher among older women). Only about 7% reported 4+ times a week.

* This is a correlational pattern across 16,000+ people.

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