Men can not urinate immediately after sex when the penis has not yet weakened, they can urinate after the penis has weakened. Ejaculation is the male ejaculation of semen during sexual intercourse, during sexual intercourse the male penis is in a state of congestion, the male penis is not yet weak after sexual activity, can not immediately urinate, which will easily lead to urine reflux to the prostate gland, inducing prostatitis. After the weakness of the urine can be flushed urethra, to prevent the semen backflow, can play a role in preventing urinary tract infection, and urine also does not cause stimulation of the penis after ejaculation. After urinating, you need to use warm water for local cleaning, which can clean the local semen, urine or female secretion residue to avoid local infection. If the patient after ejaculation urinary pain and other phenomena may be trauma, infection or other urological diseases, the need to consult a doctor in a timely manner, clear the cause of the disease, under the guidance of the doctor to do further treatment.