Impotence is a dysfunction of penile erection as the penis cannot have an erection, or the erection is not firm enough for sexual intercourse. Impotence is divided into three kinds: mild, moderate and severe. Patients can refer to the following situations to judge the degree of impotence by themselves. Mild Sexual desire is basically normal; by heterosexual sex. After the stimulation of heterosexual sex, can quickly erect; masturbation can cause erection; during intercourse, the penis can be erect but can not last, or need to use the hand to help to enter the vagina; penis erection is not firm; frequency of sexual intercourse is reduced; sexual pleasure is still possible. Medium The sexual desire is weakened; the penis erects slowly after stimulating the sex sensitive area; the penis can’t erect immediately after being stimulated by heterosexual sexual stimulation; through masturbation, the penis can barely erect; the penis often can’t erect during the intercourse, or can’t last long even though it can be erected; the penis can’t enter the vagina during the intercourse; the angle of erection is less than 90 ° and the hardness is very poor; the frequency of sexual intercourse is obviously reduced, and the sexual pleasure is significantly reduced. Severe Sexual desire disappears, no matter stimulate sex sensitive area, accept heterosexual sexual stimulation or masturbation, the penis has no erectile response; the penis can not be erected during intercourse, can not enter the vagina; the penis has no erection angle and hardness; sexual intercourse activities basically stop, no pleasure. It can be seen, to determine the degree of impotence, just to see whether the erection, erection hardness is far from enough, should also include sexual desire, sexual response and sexual pleasure and other aspects of the factors taken into account, which is more comprehensive.