Sex male urine with flocculent blood, may be urinary system infection, urethral stones, tumors and other diseases. 1. urinary system infection: cystitis, urethritis, prostatitis, seminal vesicle adenitis and other infectious diseases, may lead to sex male urine flocculent blood. 2. Urethral calculi: Urethral calculi may lead to changes in the location of the calculi during sex, and the calculi may break the local capillaries, which may also lead to flocculent blood in the urine of men who have sex. 3. Tumors: benign prostate tumors, prostate cancer, bladder cancer, urethral tumors and other diseases can also cause sex male urine flocculation. There may be other reasons for men to have flocculent blood in their urine, so it is recommended to go to the hospital in time to check the cause of the disease and follow the doctor’s instructions.