The percentage of young adults who said they did not have sex in the last year hit an all-time high in 2018.

The share of Americans aged 18-29 who said they have had no sex in the last year doubled between 2008 and 2018 to 23 percent, the Washington Post reported.

The lack of sex is being driven mainly by young men. In the last decade the share of young men saying they had no sex in the last year has nearly tripled to 28 percent. Young women have seen an increase since 2008 of 8 percentage points.

Jean Twenge, a psychology professor at San Diego State University, said that partnering up later in life is contributing to sexlessness.

“There are more people in their twenties who don’t have a live-in partner,” she said. “So under those circumstances I think less sex is going to happen.”

Participation in the labor force among young men has also declined in the last decade, and young men are more likely to live with their parents than young women.

“When you’re living at home it’s probably harder to bring sexual partners into your bedroom,” Twenge said.

She also cited technology as a factor. “There are a lot more things to do at 10 o’clock at night now than there were 20 years ago,” Twenge said. “Streaming video, social media, console games, everything else.”