History of Penile Traction Therapy | SizeGenetics

If you look back far enough, men have been trying to lengthen the penis for thousands of years, but for most of that history, they were guessing with one of the body’s most sensitive structures. Ancient records from sub-Saharan Africa, India, Egypt, and Nubia describe manual stretching, binding methods, and even suspended weights or stones used over months or years. The idea behind all of those practices was simple: apply tension and hope tissue changes. In principle, that wasn’t completely wrong. What was missing was control, safety, and medical understanding.

That’s the real dividing line in the history of penile traction therapy. Traditional methods relied on unpredictable force. Weight hanging could concentrate pressure on blood vessels and nerves instead of distributing tension where it was intended. Manual stretching offered no way to measure, calibrate, or sustain the force needed to trigger a meaningful biological response. And when you don’t control force, you don’t control outcomes. Urological literature has long recognized the risks of unregulated enlargement methods, including nerve injury, vascular compromise, erectile dysfunction, and in severe cases, permanent deformity. So the question was never just whether tension could change tissue. The question was whether it could be applied with medical precision.

That answer arrived in Denmark in 1994. Dr. Jørn Ege Siana, a plastic surgeon and co-inventor working with Danamedic ApS in Copenhagen, brought a reconstructive surgery principle into penile medicine for the first time. He understood tissue expansion, what modern medicine now explains through mechanotransduction, the cellular response to mechanical force. This principle was already established in reconstructive procedures such as burn recovery, breast reconstruction, and limb lengthening. Dr. Siana’s insight was to apply the same biological logic to penile tissue using calibrated, adjustable traction rather than crude external weight.

That invention changed everything. Instead of uneven force, the first medical penile traction device distributed tension along the shaft in a controlled way. Instead of guesswork, it allowed precise adjustment. Instead of short, improvised sessions, it was engineered for extended daily wear. Danamedic, founded in 1988 by entrepreneur and Danamedic founder Jes Bech Müller, filed the patent in February 1995. The original product launched as Jes-Extender Original, and it effectively created the category inventor since 1994, turning an ancient folk practice into a clinical therapy.

What matters most is what happened next. Independent researchers began testing penile traction therapy in controlled clinical settings. In 2009, Gontero and colleagues, writing in BJU International, reported a 1.3 cm mean gain after six months of daily use. In 2010, Nikoobakht and colleagues, in the International Journal of Impotence Research, confirmed a 1.7 cm gain in both flaccid and stretched penile length. Then in 2021, Toussi and colleagues published a randomized controlled trial in The Journal of Urology involving 82 men after prostatectomy. The traction group preserved 1.6 cm of length versus 0.3 cm in controls, with 87 percent saying they would repeat the therapy and 93 percent saying they would recommend it.

Today, that evidence base spans 15+ peer-reviewed studies and 1,000+ patients. That is why penile traction therapy stands apart from pills, pumps, and unregulated devices. It is the only non-surgical treatment for penile lengthening supported by Level I clinical evidence. It is also why language matters. A legitimate penile traction device is not just something that pulls. It has to deliver calibrated mechanical tension, fit human anatomy, and be studied under real protocols.

That brings us to SizeGenetics. SizeGenetics is the modern evolution of Dr. Siana’s original design, an FDA-registered Class II medical device and CE Marked device developed by Danamedic in Denmark. It’s built for the standard protocol used in clinical practice, typically 4 to 6 hours per day over 3 to 6 months, with clinically validated gains of 1.3-2.3 cm over 3-6 months. The device delivers up to 3,200 grams of calibrated therapeutic tension and uses medical-grade materials with a comfort system designed for extended wear. Across Danamedic’s brands, more than 1,000,000 units have been sold over 30+ years.

So if you’re researching penile traction therapy, here’s the takeaway. The history of enlargement is full of risky, unproven methods, but the modern medical version is different because it’s grounded in reconstructive science, controlled force, and published clinical evidence. If you’re going to consider traction, skip the folklore and look at the data, the device design, and the medical pedigree behind it. That’s where evidence begins, and where safer, more predictable outcomes become possible.