Need the truth on Jelqing?!?!?!?!?

ok.. so ive been doing some reading on the internet lately and i came across this " safe, efficient, and permanent way to increase your penis size" known as jelqing or milking. so i began to think "hmm what's the catch?" after extensive reading the only warning i had found was " Do not... show more ok.. so ive been doing some reading on the internet lately and i came across this " safe, efficient, and permanent way to increase your penis size" known as jelqing or milking. so i began to think "hmm what's the catch?" after extensive reading the only warning i had found was " Do not jelq with a full erection." ok no problem. but then i read one article that said jelqing would eventually cause erectile dysfunction (ED). This, however, is a big problem. i could only find a few websites that said this so now I ask the following question to all who posses knowledge of jelqing: Have you ever jelqed, what were the results and did you develop any sort of erectile dysfunction?