Leakage of urine after sexual intercourse may be due to relaxation of the pelvic floor muscles, urinary tract infection, and overcontraction of the bladder. 1. Pelvic floor muscle relaxation: With age, the pelvic floor muscles that control the urethral sphincter become relaxed, and leakage of urine after sexual intercourse may occur. If the leakage is occasional or slight, the patient can increase the contraction force of the pelvic floor muscles to reduce the leakage. If the degree of leakage is heavy, surgery may be needed to solve the problem. 2. Urinary tract infection: If the patient himself has a urinary tract infection, it may lead to an acute attack of urinary tract infection during coitus, which will cause severe irritation to the bladder, thus causing leakage of urine, accompanied by frequent urination, urinary urgency and other symptoms. 3. Excessive bladder contraction: During intercourse, after the patient reaches orgasm, the bladder may contract excessively, which may easily lead to voluntary urinary evacuation, thus causing urge incontinence, and then urine leakage. Leakage of urine after sexual intercourse may also be caused by other factors. It is recommended that patients go to the regular hospital in time, according to the results of the examination, under the guidance of the doctor targeted medication, usually before and after sex to pay attention to hygiene and cleanliness.