This question has probably been asked by almost everyone at some point in their lives. But the answers we receive vary from "it is very good" to "it is very bad". I can understand that becoming obsessive about it is bad (in fact becoming obsessive about anything is bad). But this seems a psychological effect, not one that brings actual physical harm. Is there any definite evidence to say that it is good or bad ? By bad, I mean do we see any definite physical effects like impotency, nerve weak...
