Who does this? Well, a lot of Christians do.
Some pastors make it a practice to hire staff they aren’t attracted to in order to reduce temptation.
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.)
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.