Why is the penis of a pig spiral?

Because there are spiral penis bones in pigs.

Pig whip is divided into three parts, namely, whip root, whip body and whip head. Among them, the pig penis is fibrous and thin, and the cavernous body is underdeveloped. When there is no erection, it is still hard. The front of the scrotum bends into an "S" shape and straightens when erect. The front end is spiral, which is more obvious when it is erected, and there is a small shallow groove on it; When not mating, the penis is generally wrapped in foreskin.

The influence of penis bone on animals;

(1) In the process of mating, some animals (such as lions, domestic cats, etc.) will ovulate only if they are sufficiently stimulated, and penis bone can stimulate females to ovulate, thus improving the mating success rate.

(2) Penile bone can prolong mating time, thus preventing females from mating with another male immediately after mating with the male.

(3) Some animals have special penis bones, which are easy to damage the female reproductive tract when mating with females, making it impossible for females to mate with another male in a short time, thus improving their reproductive success rate.

(4) The penis bone of some animals is hooked, and the sperm left by the last male in the female body will be removed during mating, thus improving their reproductive success rate.