My husband's fraternity had one every year, too. One year we had a pervert Picture Man. He told everybody to pick up their date in a "cradle", and that was everybody's "date picture". When the contact sheets came back we found out he had zoomed in on every girl's butt, so you could barely see your date and your face, but there were about a million shots of Levi's pockets front and center.
Thankfully my butt was only half the size it is now!