Slippery semen belongs to a kind of seminal emission when it is slightly stimulated, which may be caused by physiological reasons, or due to pathological reasons such as seminal vesiculitis, prostatitis and so on. 1. Physiological reasons: Men in puberty, due to the testicles produce a large number of spermatozoa stored in the epididymis. When the sperm is stored in excess, it can be stimulated locally, which can lead to the phenomenon of sperm slippage when it is slightly stimulated. It may also be induced by wearing tight pants or underwear, sleeping under a heavy blanket, etc., which can compress and stimulate the penis. 2. Pathological causes: (1) Seminal vesiculitis: mainly due to inflammation caused by bacterial, viral and other pathogenic bacteria infection. Due to the stimulation of inflammation, the patient’s seminal vesicles may appear to be swollen, which can press and stimulate the penis, and then appear this situation. (2) prostatitis: most of the prostatitis caused by pathogenic bacteria infection, due to the stimulation of inflammation, can make the local phenomenon of redness and swelling, so that the penis is stimulated, and then appear this situation. It is recommended that the patients who are slightly stimulated by the slippery semen, go to the hospital in time, do the relevant examination to clarify the cause of the disease, and then follow the doctor’s instructions for treatment, to avoid delaying the condition.