What are bad effects of excess masturbation ?

None: Masturbation is healthy--you won't grow hair on your hands or lose your eyesight! the only way it would be risky is if you do it in public, or with mechanical toys-especially the ribbed vibrators-i have seen some nasty vaginal tears with those --and don"t put anything in your rectum--that can be an embarrassing trip to the er! if you are masturbating constantly, i'd worry about frontal lobe probs.