I have to believe that that’s a myth. Just thinking about it for 2 seconds makes believe that nobody has ever done it. Why? Tampons have to be compressed inside an applicator for insertion. If you leave one inside the tube, it won’t soak up enough liquid to matter. Take it out of the tube and soak it in liquid, well, now it’s a puffed up, soggy mess. Good luck getting that into an orifice.