By Bruce P. Grether As an advocate of male masturbation training for excellence, I’ve sometimes been asked if masturbation can ever be harmful. If you feel at all let down, weary, or conflicted following a masturbation session, there are simple ways to enhance your practice that Erotic Engineering teaches in the Mystery School. Here are seven masturbation habits that in my experience are harmful over the long term. Any combination of these habits can cause your masturbation