Diphallia, Penile Duplication (PD), Diphallic Terata or Diphallasparatus is an intersex trait present at birth in which a individual has two penises. It is born in one of every 5.5 million AMAB or otherwise CTM individuals.
There are some medical conditions that may or may not come along with diphallia. Only 5–29% of AMAB/CTM people with diphallia experience an abnormal rotation of kidneys, abnormal sperm production, abnormality of the pubic bone, a double ureter, an abnormal placement of the opening of the penis, an extra kidney, or a horseshoe kidney.
The first case was reported by Wecker in Bologna, Italy, in 1609, and since then, about one hundred cases have been reported.