Male jumped a few years back and was stabbed by a knife around the mid-area. He survived, however since he hasn't been able to have sex. He is able to form an erection, but when the time arises it becomes limp. When trying to arouse him back into action nothing happens. He obviously wants to do go further but is unable. Besides a poor relationship in the past, he is happy and full of life, but this situation has happened for years now. Parts of his body aren't in full working conditions from the incident and long story short I'd like to know if it caused the ED he suffers from now. Any feedback is appreciated.