Most people know that sex and health go hand in hand, but are you having enough to be happy?

A recent study has shown that you don't necessarily have to have sex more often to be happy.

Research published in Social Psychological and Personality Science shows that in order to maximize happiness, it is "optimal" to have sex once per week.

Sex is associated with feeling more satisfied in a relationship," according to researcher Amy Muise, assistant psychology professor at Toronto's York University.

Surprisingly enough, a couple's happiness is not further increased the more times they have sex per week- but it can't hurt.  

A recent study revealed that United States couples are actually having less sex now, than they did in the 1990's and 2000's.

Jean Tenge, a San Diego State University psychology professor co-authored a study, that points out that sexual frequency declines with age.

"Our entertainment is more entertaining, and more on-demand than it once was," she said. "There are a lot more things to do at 10 p.m. at home than there used to be."

The study also found that the number of hours people worked, did not have an impact on sexual frequency, nor did education or race. Age, however did.

Americans in their 20s had sex an average of about 80 times per year, but that declines to 60 times a year by age 45 and about 20 times per year for those in their 60s.

Are you getting enough to be happy?