An occasional hazard of visiting a TCM is the happy ending cum spurts that have landed on the wall or floor and haven't been cleaned up. I've pulled women up about it but they always deny it and say it's just 'oil'.
That got me thinking, I've been in some rank brothels were there's been tell-tale stains on the bed sheets (Peaches in East London was gross, bed was covered in circles of white). Must be others who can say the same?