I once talked to a professional domme who said she had clients that were a couple. He would come in the wife would dictate what she wanted the domme to do to her man, which included his laying on the bed naked while the domme hit him in his balls with a big stick. She said as she did, the wife would sit in a chair in the corner watching the abuse and masturbate to it.

She said "it was pretty sick" in that the wife wanted some *real* physical abuse done to him, and the worst it was, the more she masturbated. The domme evidently didn't like how sadistic this wife was.

There is also a case wherein a Japanese wife would do horrible things to her husband. According to this story, which i read on a website years ago, the couple reached a pact wherein he would die at the ultimate act of orgasm - she suffocated him with a rope and as he came to orgasm, he was choked while she concurrently cut his balls off. She supposedly claims to have masturbated and came to orgasm as she watched him die and later carried his balls in her purse for a number of years. This was reported to be a real police case in Japan, but of course, it could be urban legend...who knows...and if anyone knows the specifics of this case (my memory isn't that good), please share with the rest of us.