Now we know how "Sex and the City's" Carrie Bradshaw could afford a closet full of designer shoes as a freelance writer: A new study finds that sexually active people make more money.
And if you do it more than four times a week, you earn even more, the study shows.
"There is a monotonic relationship between the frequency of sexual activity and wage returns," Nick Drydakis, a senior economics lecturer at Anglia Ruskin University in England wrote in a paper for the International Journal of Manpower.
When people are having sex regularly, they're happier, stronger, eat better and exercise more, researchers have found. Drydakis called sexual activity a "barometer" for several characteristics an employer would want in a worker or traits that could make someone a better worker.
"Being sexually active is a proxy for good health, and that itself is correlated with having higher energy for everything, including work," Andrew Oswald, economics professor at Britain's Warwick University, said via email.
"Physical and mental health, as well as personality characteristics, are important factors that affect wages. The patterns found in this study strengthen this reasoning," Drydakis wrote.
The "Sex and the City" bed-hopping cliché notwithstanding, marriage seems to have a lot to do with it. "Married people, particularly men, earn higher wages than the non-married," Oswald said. "One possible explanation is that such people are sociable, stable people."
(Read more: Would you give up sex to avoid paying bills?)
Conversely, a sexless marriage appears to be detrimental to a person's earning power. "Married men having no sex receive lower wages by 1.3 percent," Drydakis wrote, calling the amount "statistically significant."