The penis is very resilient and if injury does occur it is usually very minor. Natural Penis Enlargement (or that I endorse on [words=http://www.mattersofsize.com/join-now.html]MOS[/words]) can not cause impotence as the exercises are not too much different than masturbation. I have seen exercises that scare me, extreme clamping, extreme pumping, overnight Penis Enlargement, etc. but even these exercises have never caused impotence, as far as I know. To the uneducated outsider Penis Enlargement may seem extreme and these are usually the people making these assumptions. Also, companies or people selling alternative products to NPenis Enlargement are known to create scare tactics to facilitate their own monetary interests. There are more than 200,000 men on the popular Penis Enlargement forums and aside from the occasional asshole spreading SPAM I have never heard of a case of impotence from NPenis Enlargement.
There are many cases of psychological impotence and this is the reason I advocate for the mental aspects of Penis Enlargement. The brain is very powerful and the penis is a perfect target for anxiety but in every case where a man has come to me for help with this issue I have been successful at dispelling their anxiety.