Don’t rely on “ scientific evidence . Till this day no one has a answer to how all types of stutters are made. Sex is perfectly normal. But jerking off isn’t. I’m not saying it’s terrible, but if you want no anxiety and live your life the way your supposed to then no fap is the way to go. It is proven masturbating causes anxiety, depression, social anxiety, stress, etc to people. But back to my stutter. This will only succeed if you developed a stutter the way I did. At a teenage age at the same time you started masturbating. And also my stutter is is only occurred when dealing with anxiety and overthinking and lack of comfort was socially. Nofap makes that all go away. But if you have had a stutter basically all your life I doubt nofap is a solution for you.