My son is 12, and turns 13 in a few weeks. Since he was much younger he has been doing this thing where he stretches his flaccid penis. He said it was fun so I let him do it. However I recently saw him come out of the shower and his penis has gotten very long even while soft. Like 8 inches. I told him that was not normal. I'm afraid that he actually grew his penis by doing all that stretching and that he could potentially damage it. I told him to try and get an erection and he couldn't fully do it, his penis only grew another inch and couldn't get any harder. Has he given himself erectile dysfunction or does he simply need to grow more?