You definitely need science to understand it. Dopamine makes you feel good, period. Not releasing regularly the amount of dopamine masturbation provide won't change anything, except for some changes in mood (if you are used to masturbate a lot). Dopamine is released by a number of other activities, by the way. I'm sincerely happy for you if it worked, but I think is just psychological (i.e. a placebo effect). May I ask how sever was your stutter?