I may have shared this previously but I like to go into the lingerie section of M&S and get a pack of tanga briefs and a pair of frilly lace knickers then go up to the men's department and pick up a couple of shirts and trousers and head to the changing room. Put on the frilly knickers* and take out a pair of the tanga briefs, knock one out into the gusset then fold the briefs back up into the pack. Leave the shirts and trousers for the bored looking bird in the changing room to replace on the rack then return to the lingerie section and place the knickers on display and put the briefs towards the back. Out there somewhere a bird is wearing a pair of brand new knickers with my crusty jizz rubbing off into her crack. *You don't have to wear a pair of frilly knickers to do this but it gets my cross-dressing fetish out of the way at the same time as my secret gusset jizz fetish.