Well, the attraction part works on the same principle as a witch bottle: you must put your personal concerns in it. You must also baptize and name it for yourself, just as you would do when making a dollbaby on someone else. And for extra irresistibleness, put a lodestone in its heart -- because lodestones will "draw fire," if you tell them to.
The idea of a charm functioning as a decoy for magical attacks is certainly not unique --
- Palad Khik or Penis Amulet: where it comes from and how it works, and how to get your own