Recidivism rates are high (and this is my pure opinion) because there is not enough being done to help the prisoners rehabilitate to begin with. It's bad enough when they get out they will have a hard time finding a job and doing regular things.. so now let's just censor what they read and make sure they can't edcuate themselves in the arts or other areas and make it even tougher!
I understand the argument being put forth that some material could make some prisoners relive their pasts. In most cases, if the prisoner has the kind of mind that reading a book or article makes him want to do things, they are in a mental ward. Just because a person "gave up their rights" and freedom doesn't mean they shouldn't have any rights in prison. As far as making jail tougher.. seriously, that's about the worst thing you could do for rehabilitation (chain gangs, etc.). You get a bunch of men or women locked up in a jail with nothing to do but hard labor and no other outlet and the consequences will be far more severe than letting "bubba" wank off to Penthouse.
So I guess.. what I'm really saying is I hope the prisoners win this battle.. at least for the sake of letting their girlfriends/wives/husbands tell them they masterbated while thinking about them. Want a reason? How about that gives them some hope and a reason to be a better person if and when they do get out.