How to tell

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if a person is having trouble maintaining an erection how does one know whether they suffer from medical problems or it isnt just simply a case of nerves as i am some what nervous about havin sex since i did lose my erection the first time i tried hence causing me to have no faith in my erection???

If they wake up with an erection, it's probably nerves. I know this sounds cheesey (being as it was in a Sex in the City Episode) but if you put a peice of paper taped together snuggly around a penis, and it breaks in the middle of the night, then it's nerves.