Editorial
Written byMen's Health Istanbul Editorial Team
Medical reviewer (awaiting sign-off)Prof. Dr. Nika Akhvlediani
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The short answer
A three-piece penile implant is a fully hidden, fluid-filled device placed during surgery. Two flexible cylinders sit inside the erection chambers of the penis, a small pump sits in the scrotum and a reservoir of sterile salt water sits in the lower abdomen. Squeezing the pump several times moves fluid into the cylinders, making the penis firm. Pressing a release valve on the pump sends the fluid back to the reservoir, and the penis softens. Sensation, orgasm and ejaculation usually work as before, but the implant does not add length.
Key takeaways
- A three-piece implant has two cylinders in the penis, a pump in the scrotum and a fluid reservoir in the lower abdomen.
- The man controls it: pumping creates an erection and a release valve returns it to soft.
- Sensation, orgasm and ejaculation usually remain, but the device does not make the penis longer.
- It is usually considered when tablets, injections or other treatments have not worked or are not suitable.
What is a three-piece penile implant?
A penile implant (also called a penile prosthesis) is a medical device placed during an operation to allow a man with erectile dysfunction to have an erection firm enough for sex. The three-piece inflatable type is the version most people picture when they hear the phrase. It is called "three-piece" because it has three connected parts, all of which sit completely inside the body.
Nothing is visible from the outside. There is no switch, no battery and no electronics. The whole system runs on a small volume of sterile salt water and the man's own hand.
What are the three parts, and where do they go?
- Two cylinders. These are placed inside the two erection chambers of the penis (the corpora cavernosa), the spongy tubes that normally fill with blood during an erection. The cylinders take over that job.
- A pump. A small, soft pump sits in the scrotum, next to the testicles, where it can be felt and squeezed through the skin. It also carries the release valve.
- A reservoir. A small balloon holding the fluid is placed in the lower abdomen, out of sight and usually out of feel.
Thin tubing connects the three. The surgeon usually places everything through a single small incision, most often where the penis meets the scrotum or just above the base of the penis.
How do you inflate a penile implant?
To get an erection, the man squeezes the pump in the scrotum several times. Each squeeze moves fluid from the reservoir into the two cylinders. As the cylinders fill, the penis becomes firm and straight. The erection lasts for as long as he wants it to, including after orgasm, because it does not depend on blood flow.
To go soft again, he presses the release valve on the pump. The fluid flows back to the reservoir and the penis returns to a relaxed, natural-looking state. Most men need some practice at first, and the clinic team normally teaches this step by step once healing allows.
Does a penile implant affect sensation or orgasm?
The nerves that carry sensation from the skin of the penis are not inside the cylinders, so feeling is usually unchanged. Orgasm and ejaculation work through different mechanisms from erection and in most men carry on as before.
A few differences are worth knowing about. The head of the penis (the glans) is not filled by the cylinders, so it may feel softer than in a natural erection. Some men also feel the erect penis is a little shorter than they remember. That is often because erections had already weakened for years before surgery, but it is a common talking point, and an implant does not add length.
What can a penile implant not do?
- It does not increase desire, which is driven by hormones, mood and relationship factors.
- It does not treat premature ejaculation or a problem with orgasm.
- It is generally not reversible. Placing the cylinders alters the erectile tissue, so natural erections are usually no longer possible afterwards.
This is why international guidelines generally place implants after other options, such as lifestyle changes, tablets, a vacuum device or injections, have been tried or ruled out. For men for whom those treatments have not worked, it is a well-established option with high satisfaction reported in the research literature.
What can go wrong with a penile implant?
Like any operation involving a device, there are risks. The most important is infection, which usually means the implant has to be removed and later replaced. Surgical teams put great effort into prevention, including antibiotic-coated devices and strict theatre routines. Mechanical parts can also wear out or leak over the years, and some men eventually need a replacement operation. Your surgeon should talk through these risks honestly before any decision is made.
If you want to know how the design has developed since the 1970s, our feature on how inflatable penile prostheses have changed covers the history.
What to take away
A three-piece implant is a simple idea carried out with a great deal of engineering: fluid moves from a hidden reservoir into two cylinders and back again, under the man's control. It restores rigidity rather than creating anything new. If you are weighing it up, our penile implants guide explains the options and the assessment in more detail.
Questions men also ask
Can anyone tell that I have a penile implant?
A three-piece implant is fully inside the body, with no visible parts. When deflated, the penis looks and hangs much as it did before, although a partner may feel the pump in the scrotum on close contact.
Will I still be able to have natural erections after an implant?
Usually not. Placing the cylinders alters the erectile tissue, so natural erections are generally no longer possible afterwards. This is one reason an implant is not normally the first treatment offered.
Does a penile implant last for life?
It is a mechanical device, so parts can wear or fail over time and some men eventually need a replacement operation. Your surgeon can explain what to expect with the specific device.
Sources & further reading
- European Urology European Association of Urology Guidelines on Sexual and Reproductive Health—2021 Update: Male Sexual Dysfunction (opens in a new tab) (2021) Salonia A, et al.
- Journal of Urology Erectile Dysfunction: AUA Guideline (opens in a new tab) (2018) Burnett AL, et al.
- EAU EAU Guidelines on Sexual and Reproductive Health (opens in a new tab) (2024) European Association of Urology
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This article is general health information. It does not replace an individual medical consultation, examination or diagnosis. Read our editorial policy and medical review policy.
