Looking at my students today, I wondered if any girls make it all the way through college still virgins. The General Social Survey (GSS) has 129 girls ages 21-22 who were asked sometime in the past decade about sexual partners. Unfortunately, they were only asked about partners since age 18. I eliminated any girls who reported no sex with males but some with females, and I limited the analysis to the never-married. The percentage I came up with is 15.5.
So roughly 1 in 6 make it through graduation age maintaining their virginity (perhaps some of them slept with someone before age 18, but I doubt there are many). God bless 'em. You might be thinking they must be the fat, ugly ones, but when did that ever stop a guy?