>>11020900There is. Jelqing.
I have jelqed my whole life. Only a little bit though. Almost every morning in the shower I jelq to gain an erection and enjoy my morning wank.
Over twenty years I have gained about 2cm. By accident. Without even trying. Sure, I started out with 15cm and maybe this kind of thing scales with starting length but again I HAVE NOT EVEN BEEN TRYING. It's just a side effect of my morning wank.
I am certain that a determined and dedicated individual could achieve much more. Imagine if you jelqed for two hours a day. Or four. It might take a couple of years but your cock IS going to get bigger and harder.
