This isn't a study, but I can tell you anecdotally that many of our clients—and I've read this and can't tell you where those studies were, but I know I have read it as well—many young people are very precise in what they consider or would disclose as “having had sexual intercourse”. Of many things, like oral sex, they would say, “Oh, well, I'm still a virgin.” There are many ways of describing their own conduct that would tend—
On March 29th, 2007. See this statement in context.