If you estimate that, for each teen there would be an average of 1.5 parents and probably 0.1 counselors, that means that, out of 200 people, there are about 77 teenagers who are (they claim) virgins and intend to remain so.
Of course, if some of them are guys like I was in highschool, making an affirmative decision for prolonged virginity is absolutely superfluous.
But frankly, if it would get me a vacation to Las Vegas, even though I was not old enough for the casinos or bars, I would swear I was a virgin and would stay that way too.