Welcome to HealthcareMagic. The size of an erect penis usually over 2 inches is normal. Masturbation
can never cause any damage or weakness of body. The most common psychological problems can generally be related to: inhibited sexual desire, anxiety disorders, depression
, mental fatigue
, stress, guilt etc. Another issue could be feeling of guilt about how often you masturbate could be the real issue for the onset of an erectile dysfunction
. If you are experiencing negative emotions/thoughts related to the frequency of masturbation, masturbating less often may solve the problem.
Hope it helps you. Regards.