The ring is ideally given to a girl by her dad, but if he isn’t on the scene or is otherwise apathetic then she might get one herself or ask her mom for one, either because she really does want to make this commitment or possibly because the Jonas Brothers wear them. (Bristol Palin had one too.)
Sometimes in youth group a guy will stand up and ask for prayer for his chronic masturbation. Accountability partners are assigned so they can keep tabs on how they’re not whacking off. The youth group leader approaches guys at church retreats and asks “Do you struggle with masturbating?”
Who does this? Well, a lot of Christians do. If you google it you’ll find blogs and message boards filled with accounts of people who are waiting for their wedding day to kiss someone, anyone, for the first time.