Yes, it is possible to be born with two penises. The condition is called diphallia, and it is one of the rarest congenital anomalies in medicine. Fewer than 1 in a million births are affected, and only about 100 cases have been documented since the first was recorded in 1609.
What Diphallia Looks Like
Diphallia isn’t a single condition so much as a spectrum. The duplication can range from a minor split at the tip of the penis to two fully separate, independently formed organs. A widely used medical classification breaks it into four main types:
- Glans duplication: Only the head of the penis is split or doubled, while the shaft remains a single structure.
- Bifid diphallia: The penis is forked or partially divided along its length.
- Complete diphallia: Two fully formed penises, each with its own internal erectile tissue and urethral channel.
- Pseudodiphallia: A normal primary penis alongside a smaller, underdeveloped accessory one that has little or no function.
Even within these categories, there is enormous variation. Some cases involve two penises enclosed within the same outer skin, while others present as entirely separate organs in different positions. Surgeons now use a more detailed system that also describes the internal plumbing: whether a normal urethral channel is present, whether it’s narrowed or mispositioned, and whether there is one bladder or two.
Do Both Penises Work?
In most documented cases, only one of the two penises is fully functional. A typical pattern involves one penis with a working urethra connected to the bladder and a second that has no open urinary channel at all. In one well-documented infant case, the child had two complete penises but only one working urethra, with urination occurring exclusively through one of them.
Erectile tissue can be present in both organs, but that alone doesn’t guarantee sexual function later in life. Fertility and the ability to ejaculate depend on whether the reproductive tract is properly connected to at least one penis, and many cases of diphallia come with other structural differences in the urinary or reproductive system that complicate things. Doctors evaluating these cases focus on confirming which organ has the most complete anatomy before deciding on a treatment plan.
Other Conditions That Often Accompany It
Diphallia rarely occurs in isolation. Most cases involve additional differences in the urinary tract, bladder, intestines, or spine. The bladder may be duplicated or abnormally formed. The urethra may be positioned on the wrong side of the penis or narrowed. Some children with diphallia also have malformations of the lower intestine or anus. This is why the condition is sometimes described as the first visible sign of a broader set of developmental differences rather than a standalone anomaly.
How It’s Treated
Treatment is surgical and is typically performed in infancy or early childhood. The goal is to preserve normal urination and, as much as possible, future sexual and reproductive function while also addressing the psychological impact of growing up with a visible physical difference.
The traditional approach has been to remove the less functional penis entirely, keeping whichever one has a working urethra and better-developed internal structures. Surgeons determine this through imaging and direct examination of the urinary channels. In one reported case, doctors removed the larger of the two penises because it had a blind-ending urethra, meaning it had no connection to the bladder, even though the smaller one was the functional organ.
More recently, some surgeons have advocated for reconstruction rather than removal. Instead of discarding one organ’s erectile tissue, this approach combines tissue from both penises into a single, more anatomically complete structure. The idea is that preserving as much erectile tissue as possible gives the child better prospects for sexual function later in life. This is technically more complex, but case reports have shown it can be done successfully.
Can Someone Have Three?
Extraordinarily rarely, yes. The first documented case of triphallia, three penises, was reported in 2020 in a 3-month-old infant. The child had a normal primary penis along with two smaller supernumerary ones in the perineal region (the area between the genitals and the anus). One of the extras was about 2 centimeters long with a visible head; the other was roughly 1 centimeter. Neither of the extra organs contained a urethra. Only one other description of internal penile triplication has appeared in the medical literature since then, making it even rarer than diphallia by orders of magnitude.
Why It Happens
Diphallia develops very early in pregnancy, during the first several weeks when the genital structures are initially forming. The exact cause is not fully understood, but it appears to involve an abnormal splitting or duplication of the genital tubercle, the small mound of tissue that eventually becomes the penis. Because this happens so early in development, it often disrupts the formation of nearby structures as well, which is why associated anomalies in the bladder, intestines, and spine are so common. There is no known genetic inheritance pattern, and it does not appear to run in families.