From the BDSM university: Stern's guide to Slave Training. (Includes some material NSFW). Some weird and kinky stuff here; I mean whats the big deal about keeping the mouth open? :- "While in your presence your slave should never close the fists, the legs or the lips, in private or in the vanilla world. Teach your slave to keep her lips from touching (the mouth doesn't have to be gaping open, of course), to think about the position of her hands (in public, she may not be able to place them palms-up, but they can be relaxed and loose) and, if she has to cross her legs, to do it at the ankles rather than the knees. (This is manageable, even in a skirt. Allow your slave to practice in front of you until she can do this without drawing attention to herself.)".