All proven (through DNA, video, verifiable multiple witness testimony, etc.) not speculation or he said she said, cases of Rape/Incest are to be punished with either physical/chemical castration or death for violent/brutal offenders.
This is not for those cases where a victim claims rape without evidence, but rather an incentive for victims to come forward and build strong cases that prove beyond a shadow of doubt that the accused’s is a rapist.
Then the rapist should be forever unable to repeat these crimes.