I'm not that good with pain, so if he wanted to use pain as a punishment it would probably work quite well...fortunately he hasn't cottoned on to this yet. But he learnt pretty quickly that I hate to have my hands cuffed behind my back, anywhere other than the bedroom, and frequently uses this to keep me in line - he has a particular favourite which involves disabling my opposable thumbs

I hate to admit it but a good punishment is one that will make me more compliant in the future - and the thought of too much pain would definitely do that for me - even more so than restricting the use of my hands - but some things he just has to work out for himself