The penis is bent in the medical name called “penile corpus cavernosum white membrane abnormal”, that is, some parts of the white membrane more, so the penis pulled to the other side, for example, the right corpus cavernosum white membrane more then the penis will be bent to the left. The causes of penis curvature can be summarized as follows; 1, congenital foreskin tie is too short to form downward curvature. 2, circumcision surgery, unbalanced formation of bending. 3, penile traumatic scar formation bending. 4, urethral deformity downward bending formation. 5, long-term masturbation caused by different degrees of fascial damage on both sides of the sex into the left to right bending. 6, cavernous stiffness into bending. 7, other reasons.