I was thinking that the same thing could be done with locking bracelets, such as Axmar/Axsmar Hephaistos or SM Factory.
I have thought about getting this Axmar Hephaistos bracelet I already own engraved with the word βchastityβ, or βtrue love waitsβ.
One could easily imagine a situation where the son or daughter wears a locking bracelet, and the parent holds the key.