Reasons for sperm coming out after urination include seminal emission, ejaculation disorder, and just having ejaculated. 1. Semen leakage: If the patient has semen leakage, at this time the semen remains in the urethra or prostate, with the urination, the sperm can flow out from the urethra. 2. Ejaculation disorder: if the patient has retrograde ejaculation ejaculation disorder, at this time the semen remains in the bladder, with the discharge of urine, sperm can flow out. 3. Just ejaculated: when the body just ejaculated, because the sperm remains in the ejaculatory duct, with the completion of urination, sperm will also enter the urethra from the urethral orifice out. Finally, if the phenomenon of sperm flow after urination, please go to the urology department in time for examination and treatment.