Penile system? *giggle*
A fair amount of prisons teach the prisoners skills like doing car bodywork and welding and what not. They do some jobs that I think pay the prisoners. But the goal is that they can have some marketable skills when they get out of prison so they won't be working as a bagger or something when they get out, so they are a bit less likely to get back into crime.
PS: you were looking for "penal" system.
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