I've thought about this, and I'm quite reluctant to suggest it, since it involves a supremely immoral act. However, I think that if a person in prison gets raped, he should at least consider killing his attacker. I don't know how much good merely injuring the agressor in retaliation would do, and killing the sub-human bastard would hopefully deter other rapes and prevent the inmate from becoming someone's "bitch" (love-slave). He should just take care not to get caught, or it could be a lifetime in prison or the needle...
Call me cold, vicious, callous, whatever, but there, I've said it...
It is highly unlikely that a prisoner would get the death penalty for killing his rapist. Even in Texas.