I checked the new Vickers books, Behind Closed Doors which is the latest I have and he does say there is no evidence of such a dossier existing. Although he is unabashedly pro Wallis, he is a credible and respected historian. I suppose he would have the access to any such files that there are in the archives. So, perhaps it is all just rumours and innuendo. In any case, it does not take much for someone creative to stimulate a man's libido without having to learn from a Chinese brothel. Anyway, why are we even talking about their sex lives ?