The tissues will react better to the process when they are in the right state, or condition. This is addressed in part with temperature, but there's more. Pumping causes tissue to become inflated, and if correctly done, it softens and elongates the tissues without permanent damage. It's somewhat like a balloon: Compare the new un inflated state and the used un inflated state. Obviously, one is much more ready for stretching than the other. Pumping enlarges the scrotum, which makes more length for the testicles to drop into; and it tends to have some permanent enlarging effects on the testicles themselves. That's good, because low-hangers look out of place if the size of the nuts does not fit the bulk of the bag overall.
