Things that are painful have never really turned me on, and therefore I don't have a lot of positive things to say about torture and harsh physical punishment. However, there is a certain level of femdom physical torture in the namesake of "behavior correction" and pure traditional erotic BDSM that I find erotic.
Some of these pictures are fairly extreme, but also very entertaining...and might lead to a few new ideas.
We frequently go to parties locally and abroad that have a lot of these extreme torture and more traditional BDSM elements to them. I love to watch femdom activity like this as a voyeur. If its not too painful, it could be fun if my wife takes a more extreme approach to behavior correction now and then ;)