It is widely known that personal confidence helps an individual succeed both personally and professionally. Confidence is tested when a person tasks him/herself to perform a difficult deed before many people, and whether succeeding or failing, the act alone helps to hone that indomitable spirit we all wish we had. Meaning the more embarrassing or hard-to-do action before a group of people helps that much more to harden the individual, rewarding him/her with a more confident and outgoing personality.
Using that logic, masturbating in public, while being highly illegal, is the single greatest training method to make you overall a better person.