For about the past year or year and a half I have had a hard time getting an erection and keeping one for very long. As long as I have a constant stimuli (either my hand or my girlfriend orally pleasing me) I can maintain an erection, though it isn't a rock hard one. Once that stops however and I try and put a condom on it almost instantly dies. It is extremely frustrating. I used to have erections all the time randomly throughout the day. Now however I don't even have morning wood. Or if I do it feels as if its only at half an erection. I'm not sure what the problem is. On top of all that, it feels as if I don't have that pleasuring sensation in my penis until I orgasm. I can feel my girlfriend orally pleasuring me but there is little to no sensation. Since I was around 13 I have been an avid masturbater. Sometimes I would masturbate more than once a day and could never go a day without doing it. Is masturbation the cause of all this? Should I quit out right? I would really appreciate an answer. Thanks guys