Urethral bulb gland fluid is secreted by the urethral bulb gland in men. Urethral bulb gland fluid is a clear, colorless, viscous fluid that flows from the urethra when a man’s penis is stimulated and excited, and is weakly alkaline. If the fluid appears, it is mainly secreted by the urethral bulb gland, about 0.5-2ml per day in adult men, and most of it is discharged from the body with urine. In the case of sexual arousal, masturbation or sexual intercourse, the urethral glands of adult men secrete a lot of fluid. The role of the urethral bulb gland is generally lubrication, which neutralizes the residual acidity caused by urination. The urethral gland fluid often contains a small amount of sperm, so some forms of contraception that do not use insurance, such as external ejaculation, do not fully achieve the effect of contraception.