Now I'll admit that's specifically rapists, not "violent sex offenders." I've elsewhere seen a 15% rate for sex offenders being arrested again for _any_ crime. I'm sure the family and friends of Sarah Haley Foxwell will be dancing in the streets over these numbers.
Here's a great solution - commit a violent sex crime, and you get a choice - 20 years (firm) in the can, or denial of your left and right (have to figure out what to do with women).