Let me just start off by saying that I'm a
BIG believer in all constriction methods, particularly clamping. Constriction is one of the best ways- maybe
the best way- for advanced Penis Enlargement'ers to build lasting girth.
At the same time, I think pumping provides great preparation for later permanent gains in girth. With me, pumping definitely did stretch my tunica and created a lot more "meat" (loose skin, and bigger CS, CC, veins, arteries and other erectile mass) for future enlargement. Throughout the course of my enlargement since my initial pumping about 10 years ago, I've filled out a lot of that extra mass, especially at the base.
The reason I think pumping doesn't provide for lasting enlargement in and of itself, is because it doesn't promote extra bloodflow. Instead, it does just as you say: it sucks fluid in from the rest of the body. That fluid is lymph, whose primary purpose is to fight off infection. Blood, on the other hand, carries oxygen, lipids, hormones and all sorts of nutrients. DHT (testosterone) is one of those hormones and it is this hormone more than any other, which is responsible for permanent penile growth.
So pumping is just awesome for preparing your penis for permanent enlargement, but constriction and other tried-and-true Penis Enlargement exercises are what will actually make your enlargement permanent. In terms of building your circulatory system (veins and arteries), pumping is probably unmatched by any other method. More fluid, in this case lymph, is being pumped through your veins than would normally be possible by any other means. I definitely recommend it for that reason and the others I talked about above.
To
cap it all off: pumping is great for temporary gains, stretching your tunica, creating more erectile mass and building your circulatory system up. Constriction and other Penis Enlargement methods, on the other hand, are great for permanent gains- but only because DHT is being allowed to flow through your body. BTW, the DHT flows when you're horny and goes away after you've cum. That's why there is a scientific basis behind the claims about not ejaculating immediately before or after Penis Enlargement sessions.
wolfkeeper said:
As I understand it, pumping causes size increase because it sucks fluid in from the rest of the body; but doesn't particularly stretch the Tunica out which is what you need for permanent changes. Presumably the fluid acts as a cushion around the tunica and stops it stretching.
Clamping exercises are normally better for growing girth I believe because they put increased pressure on the tunica from inside; rather than reduced pressure outside.