Hi, regular masturbation has some side affect for the penis. I am not Doctor, telling from practical. My two friends did regularly, approximately 4/5 days in a week. After few months they feel that they are loosing actual feelings. Let me say clearly, at the moment of masturbation we have to catch penis strongly with hand and that time we keep it under high pressure but when we enjoy intercourse with female, that time penis keep under smooth pressure. Who has regular masturbation habit, he can't enjoy pure satisfaction from intercourse. He think pussy may be not perfect to give him full pleasure. This habit also harmful for penis vain, day by day penis vain becoming loose due to hand pressure. But weekly 1/2 time is not bad to avoid to meet unknown lady.