The male penis has a special function, the erection of the penis is mainly regulated by the hypothalamic sexual center and the peripheral regulation of erection so that the penis will have an erection. The basis of penile erection is the expansion of penile arteries and the diastole of penile cavernous trabeculae. This can make the penis have three periods of initiation, filling and maintenance of filling, and when there is a lesion in the regulatory system there is a possibility of erectile dysfunction. The erectile jumping in men is mainly a normal reflex caused by sexual stimulation. If the penis cannot be erected and throb, it is erectile dysfunction.