By Robert Preidt

TUESDAY, March 7, 2017 (HealthDay News) -- "Not tonight" seems to be an increasingly familiar refrain in America's bedrooms, according to a new study that found people are having less sex than they previously did.

Researchers surveyed more than 26,000 Americans, and found that adults had sex about nine fewer times a year in 2010-2014 than in 1995-1999.

For married couples, the survey had even more potentially discouraging news -- people who were married or lived together had sex 16 fewer times a year in 2010-2014 than in 2000-2004.

"These data show a major reversal from previous decades in terms of and sex," said study author Jean Twenge, a professor of at San Diego State University.

"In the 1990s, married people had sex more times per year than never-married people, but by the mid-2000s that reversed, with the never-married having more sex," she said in a university news release.