I would venture a guess that it came out at some point & experienced that myself several times. Once it was located in the bedding and the other times, well... lets just say that the wrong person wound up wearing it after "activity". I can't say if it's happened to others but I'd suspect it has. I'm certain it was in correctly - I'm a nurse and feel I am knowledgeable enough in the female anatomy and physical assessment to ensure it is placed properly. I wound up deciding to check placement when needed just to be safe.