Researchers have discovered something amazing about sex, and one that should be surprising to most people: we are not having anywhere near the amount of sex that we did a quarter century ago. The study, put out by researchers at Widener University in Pennsylvania, examined 30,000 U.S. adults and also found that the rate of sex plunged from 64 times per year in 2002 to 53 by 204.

Scientists found that the number of 18 to 29 year olds who were single or were simply not living with a partner increased from 48 to 64 percent between 2006 to 2014, and the rate of sex has declined precipitously as a result. Sex remained study among people without partners compared to married or live-in couples, however.

Scientists think that the increasing percentage of the population that is in a steady relationship combined with a decline in sexual frequency among those very people is leading to this decline.

“These data show a major reversal from previous decades in terms of marriage and sex,” said Jean M. Twenge, the study’s lead author and professor of psychology 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.”

“Despite their reputation for hooking up, Millennials and the generation after them (known as iGen or Generation Z) are actually having sex less often than their parents and grandparents did when they were young,” said Twenge. “That’s partially because fewer iGen’ers and Millennials have steady partners.”