University Of Chicago researchers say there's no correlation between household income and how often someone has sex, according to a published report.

USA Today reported Wednesday that the researchers surveyed 16,000 Americans between 1988 and 2002, and found that unemployed people tended to have more sexual partners than higher-income people.

The newspaper noted that earlier research had found that declining income levels were connected with sexual dysfunction in men and women.

The authors of the latest study told the paper they were surprised by the study.

"We thought we'd see some income effects," said Andrew Oswald of Warwick University, who was a co-author of the study.

But he said there was no link between money and sex.

The researchers did find a small correlation between increased income and greater happiness.

It also found people who do have sex more frequently are often happier.