to johnjo44 :If used properly a plimsoll will leave marks on a bottom for some time, not as long as a cane though. At school when changing for games I saw plimsoll marks on bottoms where you could see the pattern of the rubber tread!
to Impertinentboy1 :I posted a few links in the comments here, I can send you more links, https://xhamster.com/videos/she-hates-the-slipper-xh9eOdf#comment-108449084