The Apostopher quotes from a recent medical study:

Although teenagers who take “virginity pledges” begin engaging in vaginal intercourse [an average of 18 months] later than teens who have not committed to remain abstinent until marriage, they also are more likely to engage in oral or anal sex than nonpledging virgin teens and less likely to use condoms once they become sexually active.

And to think that in my day we settled for dry humping. Ah, to be a kid again…