Sexual arousal can be achieved through certain sensory stimulation, visual stimulation, auditory stimulation and psychological response to the male, and hospitals usually have special environments to facilitate sperm retrieval. Sperm can also be obtained by reaching ejaculation through a sperm retriever. However, it should not be too frequent. Normal male ejaculatory activity includes three physiological processes, namely ejaculation (excretion of semen into the posterior urethra), ejaculation (ejaculation of semen from the posterior urethra in a certain amount through the external urethral opening), and closure of the internal urethral opening (closure of the urethral opening while ejaculating to prevent semen from flowing backwards into the bladder). It is the excitation of the cortical center of the brain through a variety of stimuli such as thought imagination, hearing, smell, sight, taste and touch, and innervation of the relevant tissues through the conduction of nerves. Certain diseases can affect male sexual function. For example: 1, diabetes: diabetes produced by metabolic disorders and degenerative disease constantly damage peripheral nerves, autonomic nerves and small blood vessels, which leads to sexual dysfunction. 2, cardiovascular disease: including atherosclerosis, arterial stenosis and hypertension. Arterial vascular to tissue blood supply is the direct cause. 3, chronic renal failure: affect the male steroid hormone synthesis and impaired sperm production; 4, psychiatric disease: sexual dysfunction, some treatment drugs also have a certain impact on sexual function.