Why does a snake have two genitals?

Every breeding season, in most cases, a group of male snakes will compete to mate with a female snake, and the female snake is not very quiet at this time. Even after the male snake enters, it will continue to twist and even crawl forward with the male snake, so the male snake's genitals are easily damaged at this time. To ensure successful mating, they have two reproductive organs.

The mating organs of male snakes are usually not exposed in the body, but buried in two muscular penile sacs behind the cloaca, located on the ventral surface of the caudal base; The penis sac consists of a thin layer of annular muscle, which can squeeze the penis when contracting and make it turn out of the cloaca. The end of the capsule is connected to the tail muscle through ligament. There is a deep concave spermatic groove in the middle of the ventral surface of the semi-penis, which branches from the front to the top glans; During mating, two and a half penises are turned out from the cloaca at the same time, but only one and a half penises are inserted into the female cloaca; The base of the half penis communicates with the cloaca, and the semen descending along the vas deferens can be injected into the female body along the seminiferous groove.

Snakes mate for a long time, ranging from hours to days. In the mating season, a male snake can mate with several female snakes, and the mating time between male and female can be as long as half an hour to a whole day.