One thing that surprised me is that we expected, based on anecdotal evidence, that girls might be more likely to give oral sex and boys more likely to receive it, but we didn't find that at all. There's more gender equality than we expected.

Those teens who are less likely to have sexual intercourse are more likely to have had oral sex. We're not sure whether these teens are engaging in oral sex because they view it as a way to maintain their technical virginity or even because they regard it as an 'easy' method of birth control.