Not necessarily Jesus. Any invisible transcendental being watching you all the time and giving you moral rules and Prize or Punishment in the afterlife definitely helps against cheating. There are many experiments and empirical evidences in psychology about it.

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100%. Since I became a believer a year ago after extensive research, I stopped watching porn after 30 years. Nothing worked until then. If people aren't afraid of God, they'll do whatever they want, cause.. . why not... we all just die and dissapear and there's no recourse. My life is 10x better since becoming a believer. Humans, just like dogs, need rules. It doesn't work with just the carrot, we need a stick as well.
I cannot define myself a believer. Nor an atheist Let's say I'm still in search. However I definitely recognize the positive and moral role of religions for individuals and society as a whole if they aren't interpreted in a fanatical or intollerant way and they are separated from the State and its laws. I see many issues with monotheistic organized religions across history though.