This article in Freakonomics was interesting:
http://freakonomics.blogs.nytimes.com/2009/04/14/friday-night-lights-and-the-teenage-virgin/ Incidentally, what % of your high school class were still virgins at graduation? I think it was pretty high at my HS - I remember being surprised that people had sex at all. I don't think any of my immediate friends had sex (did you? haha).
Also, if you scroll to the bottom of the post, there's a graph that shows % of people who are virgins by major, in college. Bio is highest at 73%. Frankly, that surprises me. Bio beat math and physics and engineering?? Really? Maybe all the unpopular kids at MIT were bio majors? Or the bio majors that they polled tended to be younger? I have no idea... this study doesn't claim to be too scientific, but weird.
Bio majors? Really?