Raise them on a book called I Kissed Dating Goodbye by Joshua Harris. Libby Anne explains.
As a girl, I was told not to “give away pieces of my heart.” That meant that I was to make sure not to fall in love, because if I fell in love with someone I would give him a piece of my heart, a piece of heart that I would now no longer be able to give to my future husband. I would essentially be emotionally cheating on my future husband. In order to keep myself pure, I had to guard my heart and my emotions carefully.
Practically, what this meant was that ever time I had a crush on a guy I knew I felt incredibly guilty. I believed that I was giving away a piece of my heart, and I would never get it back. I was so afraid to love, too afraid to even want to start a relationship. I must, must, must keep myself pure! I thought to myself time and again. Turn your eyes away! Turn your thoughts away! Guard your mind! More chores, more homework, more searching for wild herbs and learning how to can – anything to stay away from boys and any thought of guy-girl relationships! I must keep my heart pure!
This book is very popular in conservative evangelical circles, so there are lots of messed-with young people out there.