The hardness of male penis erection will not be like a stone. Clinically, the general hardness of the male penis after erection is divided into four grades, in which the fourth grade belongs to the best state of erection, which is fully erect, can complete any action of sexual life, hardness is roughly like a cucumber; and the third grade of hardness is roughly like a banana with skin, can complete sexual life, but the state is inferior to the fourth grade of hardness, but usually there is room for improvement; second grade of hardness of the erection is just like a banana peeled by The second level of hardness is like a peeled banana, there is a physiological response to sexual stimulation, but it is difficult to complete the insertion of action, belonging to the middle degree of impotence; and the first level of hardness is subject to the corresponding sexual stimulation will have some response, but the hardness is not enough, like tofu, which belongs to the heavy degree of impotence.