Alright, I came to this conclusion because of two things. One is the tunica is made up of a semi-tough ET that, when under pressure, expands but only to a certain degree. Two this exercise causes expansion but then it pushes past the expansion point causing tears. This is not the case with some other girth movements as they only rely on a single hand or the pressure from the dual hand is not as high. With this movement the dual jelq portion acts as a prying force internally, because you are squeezing both hands down and up towards each other as well as rolling the pressure around. The fibers of the tunica expand and then SMALL tears start to occur leaking fluid, as well as blood plasma that causes staining. I'm not concluding that this exercise is bad or that it doesn't work. I am stating, quite clearly, that doing more than a few of these goes beyond what is necessary to grow and ultimately that's what we're all here to do.
This idea was born out of research, personal experience, and application of the forces involved during the exercise. I will throw in the fact that I have extremely strong hands and forearms and that there are times I have used entirely too much force. That's one of the biggest reasons that I started to explore girth exercises and how to gain without going beyond the necessary expansion into injury.
Crazyed, Peyronie's disease is a connective tissue disorder involving the growth of fibrous plaques[1] in the soft tissue of the penis affecting as many as 1-4% of men. Specifically the fibrosing process occurs in the tunica albuginea, a fibrous envelope surrounding the penile corpora cavernosa.
If overtime the penis is consistently injured the body will consistently try to heal itself. Similar to sediment buildup in a river the tissue thickens and can eventually be significant enough that peyronie's disease occurs.
