I have a suggestion: first rape conviction = vasectomy. Second conviction = castration.
The muzzie rapists will self deport quickly.
Rape is more a crime of violence than sex.
I suppose castration would cut the testosterone level and reduce some of the aggression, but they would still be able to do violence. They would just do something different to hurt people.
Until and unless their mental and moral state is changed, the only real solution for crimes like this is eradication. The death penalty is not about revenge per se, but protecting society from incorrigibles who will never change. Too many repeat offenders.