Here's some links to professional ballbusters who claim they'd be willing to do permanent damage to a client's testicles:

Mistress Gemini (Seattle)

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She is known for being interested in castration. In an interview she says:

"Question: Suppose you were having a ballbusting session with a guy and he said that he wanted you to cause permanent damage...would you?

Answer: I have caused damage by request. I had a friend of mine who actually helped me go from lifestyle domme into pro, ask me to completely crush his lefts testical, well he got it. He's happy about it too. That was a blast and a huge rush!"

Here's a link to her site. She's quite hot actually! http://www.brutaldomination.com/

Mistress Cassandra (Los Angeles, Asian)

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She is known for her martial arts style kicks to the balls. In an interview she says:

"Question: Suppose you were having a ballbusting session with a guy and he said that he wanted you to cause permanent damage...would you?"

Answer: If the client was in his right mind and with a detailed contract, sure."

Here's a link to her web site: http://www.asianfemdom.com/cassandra/bio.htm

Jazzmon Radford (Florida, African-American)

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Major bodybuilder, she said in an interview:

"Question: Suppose you were having a ballbusting session with a guy and he said that he wanted you to cause permanent damage...would you?

Answer: Depend on my mood on that day. Then I would have to think about my ex-husband."

Here's a link to her Web site: http://jazzmon.thevalkyrie.com/

Carmen Li (Chicago, Asian)

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She seems pretty accepting of permanent damage. She said in an interview:

"Question: Suppose you were having a ballbusting session with a guy and he said that he wanted you to cause permanent damage...would you?

Answer: Absolutely. But only after knowing the person for a little while. Men tend to think they want things, but not be able to handle them. So I won't do anything permanent until I've seen a person a few times, and have begun to understand their psyche."

Here's her web site (you'll have to select her from the menu on the left): http://www.eros-chicago.com/sections/bdsm.htm

There is also a picture and a bio here: http://www.u.arizona.edu/~julianap/filmfest/bios.htm. Based on the fact that it mentions she is a cellist for a punk band called Apartment, I believe she is the asian girl shown here (look at the bio for Natalie Nyugen): http://www.oneway.com/apartment/home.html. It is interesting because she looks very nice, but must have a nasty streak.

Some updates to the previous info (nine years later):

Mistress Gemini's site is now at: http://www.controlling-bitch.com/

She still seems pretty brutal -- the description of one of her videos on the site says:

Razor blade CBT, sounds, lighting his cock on fire was great fun... Hahaha nut kick with my spiked heels that rips his nut sack wide open. Better make the other side match, I can't resist sitting on his face and making him worship my ass while I torture his cock. Whoops this patient needs about 20 stitches with a regular sewing needle and fishing line... Poor fuck!

Mistress Cassandra has a few pictures around, but she doesn't seem to work for Deviant Domain anymore, probably retired:

http://www.naughtyreviews.com/escorts/m ... ian-female

Jazzmon Radford is dead due to a medication mixup after breast augmentation surgery. You can read about it here: http://jazzmon.com/

Carmen Li seems to be retired from being pro domme, but as mentioned before she seems to be the same person as Natalie Brewster Nguyen (now living in Tuscon) doing performance art. Based on her tattoos, her interest in alternative performance, and some of her crappy art punk music projects I think should would be a good dominatrix. I kinda would like to look her up, since she doesn't seem to be a pro domme anymore but has clearly stated she would do permanent damage to a guy she believed wanted it.