The last study also makes me wonder whether jelqing is such an effective form of PE because it basically applies stress to the tunica both lengthwise and girthwise (circumferentially). Jelqing may prevent excessive alignment of collagen fibrils along either “direction.” Because the fibrils can’t align to resist added stress, higher resistance to stress can only be achieved by adding more fibrils—i.e., tunica enlargement or (heaven forbid) thickening.
I guess a counterargument could be that the tunica has two layers—an outer lengthwise layer and an inner girthwise layer. Jelqing may transmit virtually all the lenthwise stress to the outer layer, where the fibrils can align longitudinally, and virtually all the girthwise stress to the inner layer, where the fibrils can align circumferentially.
So perhaps the body’s not so stupid afterall :( .
But still, some circumferential stress must be applied to the outer layer, which does, after all, expand girthwise during a jelq. Likewise for the inner layer, which expands lengthwise. So, maybe jelqing does provide a small benefit in randomizing the fibril alignment.
I don’t like playing devils advocate but do you have any electron micrographs of the collagen arrangement of the tunica. You are comparing very different tissues with different functions that happen to have collagen in common. I am not saying you are wrong, just that it might be easier to imagine similar processes are taking place if you could direct us to images so that we could evaluate whether this make sense for the tunica.