Group therapy curbs sex offenders' recidivism: ministry

Chemical castration would also work.

Ist chance: therapy with a dose of hard labor. Good.

Second chance: as @disillusioned suggests, but blunt rusty scissors maybe a cheaper, quicker option.

The recidivism rate for executed convicts is zero.

A lot of real hard liners on this website, some of the things they suggest would've been severe even in medieval times.