Like stated earlier, there are supposedly exercises you can do to stretch the tendons at the base, but from what I have read, you have to keep doing them forever to keep the length gains.
I think most guys are insecure about penis size. Average is like 5-6 hard, and supposedly more than 6 is a waste anyway?? I'm like a 7 and I still feel small. I'd like to be a solid 9 inches.