Following is a video of a beautiful dominatrix who has two absolute rules: First, she will never be nude or even topless, and it pisses her off to even ask for her to reveal anything. Second, all of the men must be completely naked as it shows her respect of her superior position. I firmly believe in this policy between dommes and their subs and think it is a great rule even when (or particularly when) other females are present.

In the following video, she ties up her naked sub with his hands stretched above his heads. She has on boxing gloves and uses him as a punching bag. Every few punches she surprises him with an upper cut punch into his balls causing him great pain. As she does she giggles and laughs, clearly enjoying her ability to randomly and without his having any ability to defend himself, punching him in his balls as hard as she wants whenever she wants.

I emailed her and told her what a fantistic job she did, and she sent me back a nice reply saying how much she enjoyed punching him in his balls and seeing his pain - she's simply wonderful :

http://rapidshare.com/files/8304830/box1.ram.html

Here's another clip of the same encounter with her:
http://rapidshare.com/files/8305803/box2.ram.html