I have wondered for a long time about alternate training techniques and methods.  While I know from my own experience that I can get away with leash, collar, breast bondage on in public.  I have regularly used nipple clamps, crop, clothes pins etc in private. I also know that I can and have spanked her and pinched her nipples in public.  

I know protracted periods of nipple clamps, and the use of the crop and really hard nipple pinching all greatly increase compliance.  Even spanking will create a reasonably good result, and when I have been caught spanking her, or pinching her nipples in public she has reacted in a way that reinforces the view of others that she is fair game.

I have had the experience of spanking her bare ass in what I thought was a secluded spot because she had not been compliant enough.   I had her over my knee and had pulled her skirt up and was intent on spanking her.  I was just about finished and her ass was nice and red, when I looked up and realized there we a couple of guys standing and staring at us and saying nothing.  They clearly enjoyed the show, and seemed to think it was great that she had been totally exposed in what for a regular woman would be an incredible humiliation. Of course every time she is disciplined, it makes it easier for her next time, and makes her more compliant. 

I have gotten to the point that I wonder whether I could get away with locking a shock collar on her and using it in public. I know if told her she had to she would, I am just uncomfortable with the general reaction.  What do you think of using a shock collar on a sub woman?  Would people be upset or think it was cool?