Hi, I've been suffering from erectile dysfunction. I am able to have erection at random times but i am not able to control it. When i tried with my girlfriend there was no erection at all. The random erections i used to have stays for short time. I niether smoke nor drink. I am 93 kg of weight but my height is 6'2". So i think I'm not much overweight. I don't know the reason of my problem and it cure. please help!