In the following video the man is completely naked with his hands chained above his head. Eventually, even his legs are spread wide with a metal spreader. The female has an extremely well built body and is very athletic - awesome ass! It is obvious she's been trained in some type of kick boxing.
He then becomes her human punching bag. She hits and kicks him hard wherever and whenever she pleases identically to the way she would on a regular punching bag, and there's nothing he can do about it. She punches him in the face, chest stomach and with his legs forceably spread wide with the spreaders, his exposed penis and balls dangle there for her very easy access as gives him a hard front kicks up into his balls making him yell. Towards the end, she delights in targeting a rapid flurry of punches into his penis and balls.
Video - 177 MB:
http://www.megaupload.com/?d=DJD4HKXK