Intercourse may cause painful urination. If you do not pay attention to hygiene during sex, it will lead to pathogenic bacteria infection and cause local inflammation of the urethra, so it will lead to frequent, urgent, painful urination, and even to flesh-eye hematuria. It is recommended to pay attention to hygiene before and after sex when having intercourse to reduce inflammatory reactions not only in the genital tract but also in the urinary tract. Because the female urethra itself is short and straight, and relatively close to the vaginal opening, it is especially prone to urethral infection. It is recommended to drink more water in daily life to increase the volume of urine and reduce the possibility of inflammatory reactions caused by pathogenic bacteria in the urethra, and it is best to wash the vulva and urinate once after intercourse to reduce the chances of pathogenic bacteria infection.