A purity ring is a reminder to yourself that you made a promise to stay pure. This can be a religious promise or it can be something chosen for other reasons. The idea is that you wear the purity ring until marriage when it is then acceptable to lose your virginity. Purity rings are obviously less popular now than they were sixty years ago but a lot of young women still wear them. It seems though, that maybe they don't often stick to the 'contract' a purity ring brings with it.