There used to be a fad weight-loss method (working no better than any such ever did) that “worked” by stimulating instant water loss; the method was to wrap yourself in food wrap (cling wrap, shrink wrap, Saran wrap) and then exercise vigorously or sit in a hot room, thus sweating out all the fluid in your body at once. It was dangerous and pointless, and therefore extremely popular. I thought of it at once when I saw this domme in shiny hot (!) rubber trying to vigorously whip four tied girls at the same time:
If anybody knows the movie source for this .gif, please share the information.