I have to go with Eponine's idea. Thus far I think that I would actually enjoy a punishment, but I would get the point, as long as the punishment wasn't too enjoyable. Say, being teased and not allowed to cum for a series of hours or days. The simple disappointment would probably stop me from doing whatever it was again.

I have actually never been punished before in a bdsm sense, so I am not really sure. I have had my little day dreams about it though. My own ideas for it....