Chemical castration is the only obvious solution to this problem. If you are willing to go after minors and children, then be prepared for a sexless life.
Background and context
Many people consider sexual abuse one of the worst crimes a person can commit. In these circumstances, it has been proposed by some that such an offender should be punished, normally in addition to a jail term, by castration.

Castration can involve the surgical removal of the testes. Or, "chemical castration" using hormones to dramatically reduce testosterone levels in order to effectively render the sex offender impotent. What is to be counted as a sufficiently serious ‘sex crime’, the type of castration to be used, and the circumstance under which it would operate are all variables in this debate. Nevertheless, the question of whether castrating sex offenders can
ever be an appropriate societal response is widely debate. The Czech Republic was one of the first countries to legalize chemical castration. Poland
[1], South Korea, Germany, Denmark, France, and Australia have followed. In the United States, states that have legalized "chemical castration" include Georgia, Iowa, Oregon, Oklahoma, Louisiana, Montana, Texas, Wisconsin and Florida.
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Castration of sex offenders has been effective Dr. Martin Holly, a leading sexologist and psychiatrist who is director of the Psychiatric Hospital Bohnice in Prague, said none of the nearly 100 sex offenders who had been physically castrated had committed further offenses. Furthermore, a Danish study of 900 castrated sex offenders in the 1960s suggested the rate of repeat offenses dropped after surgical castration to 2.3 percent from 80 percent.
[3] In addition, a 1981 study conducted with 48 males with long standing histories of sexually deviant behaviour, found that 40 of these individuals given doses of medroxyprogesterone acetate for as long as 12 months had diminished desires for deviant sexual behaviour, less frequent sexual fantasies, and greater control over sexual urges.
- Castration subdues libido and psychological factors in predation. A Polish government official said after Poland passed a mandatory chemical castration sentencing law in 2010: "The purpose of this action is to improve the mental health of the convict, to lowered his libido and thereby reduce the risk of another crime being committed by the same person."[4]
- Castration combined with treatment reduces recidivism risks. Governor Celso Jaque of Mendoza Argentina, announced in March of 2010, "By using medication that lowers the person's sexual desire and with psychological treatment, the person can be reintroduced into society without being a threat."[5]