Penis enlargement (PE) is often surrounded by scepticism and misinformation. While it's true that many dubious products, such as creams and pills, flood the market, science does provide evidence that mechanical devices can effectively enhance penile size. Let’s demystify the mechanics and biology behind PE devices, such as pumps, clamps, traction devices and attachments.

To understand how PE devices work, it’s useful to have a grasp of the basics of penile anatomy and the mechanics of an erection. During sexual arousal, the nervous system initiates the release of neurotransmitters that relax the smooth muscles within the arterial walls of the penis. This relaxation causes vasodilation, allowing increased blood flow into the sinusoids of the corpora cavernosa. The corpora cavernosa are two sponge-like regions of erectile tissue which swell with blood, leading to an erection.

The rigidity of an erection is maintained by the tunica albuginea, a dense fibrous sheath surrounding the corpora cavernosa. When the corpora cavernosa expands, the tunica albuginea stretches and compresses the veins that normally drain blood from the penis, creating a low-flow state that sustains the erection. The outflow veins are trapped between the inflating balloons (the corpora cavernosa) and the tunica - this is called the veno-occlusive mechanism. The tunica is ultimately what determines the size of your penis - how far it can be inflated before there is no more flex.

Collagen, the primary structural protein in the tunica albuginea, plays a key role in maintaining penile rigidity and shape. Collagen fibres in the tunica albuginea are organized in layers, providing strength and elasticity. When moderate tension is applied, these fibres deform elastically, returning to their original shape. However, with repeated, greater tension, the fibres can undergo plastic deformation, meaning they retain their stretched shape. This is the principle behind PE devices: to induce plastic deformation through controlled, repeated stretching.

1. Mechanical Stretching:

• Pumps, Clamps and Traction Devices: These devices apply continuous or intermittent pressure or tensile forces, stretching the penis and the tunica albuginea along with the suspensory ligaments. Over time, this repeated stretching causes plastic deformation of the collagen fibres, resulting in increased penile length and girth. The process is similar (but not identical) to how skin can be stretched using progressively larger earrings, or how shortened tendons are rehabilitated through physiotherapy to become longer. 

1. Cellular Response:

• Mechanotransduction: Embedded within the collagen matrix are fibroblasts, cells responsible for producing collagen and maintaining tissue integrity. When stretched, fibroblasts undergo mechanotransduction, a process where mechanical signals are converted into cellular responses. This triggers the production of more collagen and other extracellular matrix components, reinforcing and expanding the tunica albuginea. Cell-stretch events also trigger the release of compounds which temporarily make the tunica more malleable.

Several studies have demonstrated the efficacy of PE devices. For instance, the “P-Long” pilot study (Brandeis, 2023 ) showed significant increases in penile length and girth using a combination of traction and vacuum devices over a six-month period. Although the study had a small sample size, the results indicated that such mechanical methods could be effective without adverse effects. Link 

Another study explored the effects of vacuum erectile devices (VEDs) in a rat model with cavernous nerve injuries. This study focused on the therapeutic potential of VEDs to enhance penile length and improve erectile function, supporting the concept that mechanical devices can facilitate penile enlargement through cellular and tissue remodelling. Link

Beyond the scientific evidence, we have the “wisdom of the ancients” - practical knowledge accumulated over more than thirty years of internet-based PE communities. The routines we recommend are all based on both an understanding of the science and the wisdom of the many men who have successfully grown their penises.

While the science supports the potential of PE devices, success depends on consistent and correct application. It’s vitally important to follow recommended protocols to avoid injury and achieve desired results. Overuse or improper use of these devices can damage sensitive penile tissues, so caution and adherence to guidelines are paramount. With Fenrir’s products, you get not only safe and effective devices, but also great customer support and advice about routines for beginners and advanced PE'ers alike.

In summary, mechanical PE devices like pumps, clamps, traction devices and our attachment mechanisms do have a basis in scientific principles and can grow your penis when used properly. They operate by inducing plastic deformation in the collagen fibres of the tunica albuginea and triggering cellular responses that promote tissue growth. While these methods are not overnight solutions, they lead to significant and safe enlargement with sustained use over time.

For those considering PE devices, understanding the underlying science can help in making informed decisions. Proper use, consistency, patience, and realistic expectations are key to achieving successful outcomes.

If you want to delve even deeper into the science of penis enlargement or learn more about tips and tricks, such as the use of infrared heat or combining clamping with pumping, or pumping with vibration, please have a look at Karl Wikman’s PE blog, hosted here. His blog covers a wide range of topics - both scientific and practical - all about growing a bigger and better penis.