I am 18, i masterbrate everyday but 1 time a day. I try to control masterbration .. as i controled past 10 days.. but i watch some photos i keep my penis erect.. after 10 days i saw that my erection getting weak.. i tried to keep my storng erect but day by day erection getting weak i masterbrated when weak but it totally weak,, i watching nude photos too but not able to get erect and lack of sexual desire because of erection problem.. what i have to do.. please tell me a solution please help me..