Hi. You are correct to clear doubts. In childhood everyone is taught that excess of anything is bad. But people forget the sermon when they are supposed to understand it. Its learnt automatically even when no one teaches it. See an old movie The blue lagoon . I mean to say gratication by this action of masturbation is natural but when excess is done, the cavernosa in penis is strictured and hampers with blood filling. Hence all the problems of erectile dysfunction and sexual intercourse begin. Ayurveda has in depth scientific studies to its credit. All the seven elements of human body viz. Rasa to Shukra are deteriorated by inverse depletion of Dhatus ( elements) by excess masturbation or unnatural or natural excessive sexual acts. This leads to weakness, emaciation and impotency too. Any Ayurveda specialist can explain it well to you. Hope you will restrain yourself to protect your health and future potential problems.