Sometimes it seems like everyone is doing it…especially if you’re not. But less than half of teens in high school (only 42% of girls and 43% of boys) have had sex. That means that more than half of all high school students are virgins. And the younger someone is, the more likely they’re a virgin. For example, less than one-third of teenagers age 17 and younger have had sex, while 60% of 18- and 19- year-olds have.