There's more to acne than stress or blood circulation
Very true, but it is a factor so it must be considered just as equally as other possible causes of acne, such as diet, exercise, genes, lifestyle, hygene, etc.
But just for thought- even if it is proven that masturbation is the cause of acne, then what? Would anyone give up sex/masturbation for the rest of their lives? I don't know, my friend!
Not here to argue, by the way- hope this doesn't come off as threatening or anything! Just my take. I guess either of us could be right... Maybe one day we will know the truth!
Good luck guys!