Why do we have separate male and female prisons anyway? Many people would say that one reason is to protect women from the risk of rape/sexual assault by a man (i.e. a penis-haver) as, no matter what her crime, the risk of rape is categorically NOT a part of her legally-sanctioned punishment.
Even though the majority of penis-havers- including those in prison for non-sexual, non-violent crimes - may have no intention whatsoever of ever committing a rape, the fact that they are physically equipped for it means that it is still too great a risk for them to be imprisoned at close quarters alongside women.
That being the case, what possible justification could any sane person ever give for imprisoning a penis-haver WHO HAS PREVIOUSLY BEEN FOUND GUILTY OF USING SAID APPENDAGE TO COMMIT RAPE - alongside women???? Primary consideration must always favour the potential victim rather than the proven aggressor.
As a very accommodating concession, it MIGHT theoretically be acceptable to allow said penis-haver who now identifies as a female into a female prison if he/she agrees to completely surrender the weapon that they used for their crime by having it permanently surgically removed. After all, nobody would dream of letting a knife-murderer keep their knife on going into prison, would they? Why ever could somebody identifying as female want to own a penis, anyway? Or is that different, because it involves the criminal having to choose to make a sacrifice rather than everybody else being forced to?
Whatever gender (or none) you identify as, it's perfectly simple to avoid being imprisoned for rape as the vast majority of penis-havers do. All you have to do is.... nothing at all.