Most little girls fantasize about their wedding day. Some dads are now capitalizing on this, and throwing their little girls the “practice weddings” they want… with one catch. Known as “purity balls” involve a ceremony at which American girls vow to their fathers that they'll remain virgins until marriage. Photographer David Magnusson has captured images of this new phenomenon, to be included in a book aptly titled Purity. After being featured in the book, these dads will likely have a much easier time keeping boys away from their daughters.