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Stretching consists of attaching a penis stretcher or “extender” device to the penis for set periods of time. The device exerts a constant traction on the penis, which, in theory, lengthens and widens the penis. The traction supposedly causes the cells in the penis to “split” and then reform and expand. Whether or not penis extenders actually work is subject to debate - much like all methods of penis enlargement.
In an episode of the Five (channel) documentary series A Girl’s Guide to 21st Century Sex, stretching by means of a plastic-and-nylon penis extender resulted in no penile enlargement. A 30-day test was conducted whereby three participants had their peak erection lengths measured before the experiment. One of the participants was given a penis extender and was told to use it for 30 minutes to 1 hour each day for 30 days. After 30 days, the test subject who was assigned the penis extender was the only one who turned up no improvement whatsoever. The subjects who used a penis stimulating cream for penile massage and a penis pump, on the other hand, each gained 1 inch (25 mm) in length after 30 days. There is a high likelihood that penis enlargement only takes effect with regular expansion and stretching of the corpus cavernosum. The penis will have to be engorged and stretched. Passive stretching such as the use of a penis extender did not aid penis enlargement in any way.