Im 19 and I have been having a hard time keeping a hard erection. When I do have one, it isnt very hard, and ill probably lose it in a minute or 2. I cant figure out what could be the problem. Im 5'11'' 145lbs, I just recently had a physical and he said everything is O.K, Im not stressed and get plenty of sleep. Any ideas on what the cause is? Or any ideas to help improve my erection? Thanks
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