Hi doctor,im a man of 25 years old,i have a big problem,i was mustarbating for last 5years,then last year i get a g.f,everythng was fine until this year january,i started to gain weight(big stomach),from that tym my penis cant go up as i knw,sometyms it can go down while im busy having sex(inside).or after having sex once,it can stay down for the whole day without going up,even if she can touch me,i dont realy understand whtz wrng,i started excersing,but nothing change,i also quit alcohol n smoking at january,wht is the course of this DR,PLEASE HELP ME?