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The Padung peoples of Thailand use brass rings to copress the rib cages of their women giving their neck a lengthened look. How effective would the same princaple be on a penis over a longer period of time without removal and constant adding?
That principle wouldn’t work because it relies on the compressibility of the upper torso (clavicle, shoulders) and gravity. The pubic bones are much stronger than the rib cage and the angle at which the rings would have to sit would not allow gravity to assist. Stretching the soft tissues of the penis is much easier.