An anonymous reader writes: A survey of nearly 27,000 people suggests that millennials are less likely to be having sex than younger adults were 30 years ago. The Guardian reports: "The research, conducted in the U.S., found that the percentage of young adults aged between 20 and 24 who reported having no sexual partner after the age of 18 increased from 6% among those born in the 1960s, to 15% of young adults born in the 1990s. Published in the journal Archives of Sexual Behavior by researchers from three U.S. universities, the study involved the analysis of data collected through the nationwide General Social Survey that has asked U.S. adults about their sexual behavior almost every year since 1989. The results reveal that young adults aged between 20 and 24 and born in the 1990s were more than twice as likely to report that they had had no sexual partners since the age of 18 than young adults of the same age born in the 1960s. Just over 15% of the 90s-born group reported that they had not had sex since they turned 18, compared to almost 12% of those born in the 1970s or 1980s. For those born in the 60s the figure was just over 6%. The shift [towards increasing abstinence seen among all adults since the 1960s] was greater for white individuals, those who had not gone to university, and those who attended religious services. The trend was also greater for women than for men: the authors found that 2.3% of women born in the 1960s are sexually inactive, compared to 5.4% of those born in the 1990s. That, the authors suggest, could in part be down to a rise in so-called virginity pledges as well as concerns about social stigma. As for why this is the case, the authors of the study suggest it could have something to do with the fact that young people are living at home for longer, thus "stifling their sex life," and playing video games and consuming media in their free time. In addition, easy access to pornography may also be playing a role. A co-author of the research, Ryne Sherman, also suggests another factor could be that the way in which people interpret questions asked in the survey has changed. "Young people in the 1950s, when they were asked if you had a sexual partner, [might] say 'oh oral sex, that counts,' whereas young people today might say 'oh no that doesn't count because I didn't actually have sexual intercourse,'" he said.