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@Alec
I'm uncomfortable with the idea of monetary recompense for the victim. It's like puting a dollar value on their body (or at least access to it) and that could do more psychological harm than good. As for castration, well if you think a castrated person cannot also be a rapist then you do not actually understand the act you are discussing. It may act as a deterrent to other rapists but it would not necesarily prevent the castrated individuals from committing future rapes.
It seems that a less extreme punishment may serve the same purpose and also once that has happened what can you possibly threaten them with in the future.