Diphallia

Diphallia, penile duplication (PD), diphallic terata or diphallasparatus is an intersex genetic condition present at birth in which a person has two penises. It is born in one of every 5.5 million AMAB individuals.

There are some other medical conditions that may or may not come along with diphallia. Only 5–29 percent of AMAB 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.

History
The first case was reported by Wecker in Bologna, Italy, in 1609, and since then, about one hundred cases have been reported.

Resources

 * https://www.healthline.com/health/diphallia
 * https://en.wikipedia.org/wiki/Diphallia
 * https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3446048/
 * https://happymag.tv/man-with-two-penises-has-sex-with-1000-people/