The jobless have more sex and more sexual partners than people who work, say American economists.
And piles of money cannot buy you love, a survey by the National Bureau of Economic Research in Massachusetts has confirmed.
After asking 16,000 Americans rather personal questions about their bank balances and love lives, the researchers say sex is the thing that makes people happiest.
And highly educated people are more likely to find ultimate pleasure from a roll in the hay than those with fewer academic qualifications.
People who have sex more often are happiest, but monogamous people tend to be happier than the promiscuous.
And while sex makes people smile, the survey finds that daily commuting is the thing that makes them most unhappy.
The researchers are trying to determine whether happiness can be measured by economists. Distilling the emotion into an econometric formula is a potential goldmine for marketing companies.
