This article is about the US, but I welcome comments regarding other countries.
Today, fewer than half of all high school students have had sex: 47.8 percent as of 2007, according to the National Youth Risk Behavior Survey, down from 54.1 percent in 1991.
A less recent report suggests that teenagers are also waiting longer to have sex than they did in the past. A 2002 report from the Department of Health and Human Services found that 30 percent of 15- to 17-year-old girls had experienced sex, down from 38 percent in 1995. During the same period, the percentage of sexually experienced boys in that age group dropped to 31 percent from 43 percent.
The rates also went down among younger teenagers. In 1995, about 20 percent said they had had sex before age 15, but by 2002 those numbers had dropped to 13 percent of girls and 15 percent of boys.
“There’s no doubt that the public perception is that things are getting worse, and that kids are having sex younger and are much wilder than they ever were,” said Kathleen A. Bogle, an assistant professor of sociology and criminal justice at La Salle University. “But when you look at the data, that’s not the case.”