First, that our bodies naturally produce things like semen and testosterone, and masturbating helps to regulate these things. even if you didnt masturbate, you would ejaculate in your sleep to accomplish this.
Second, that our minds can sometimes be so distracted by sexual thoughts that we cannot give our full attention to other tasks. whatever chemicals are released after [your release] can actually improve your functioning. I have friends that swear that it is an essential part of their study routine.
you shouldn't feel guilty about doing something that everyone else also does. a healthy sex drive is nothing to feel ashamed about! (unless your thoughts wander somewhere that your conscience does not approve of.. but that is a completely different topic!)
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