Intercourse may lead to urinary tract infections, mostly in women, especially newly married women. This is mainly due to the anatomical characteristics of women, whose urethra is closer to the anus and vagina, and therefore vulnerable to contamination by anal and vaginal flora, leading to urinary tract infections. Some women fall asleep soundly after intercourse and do not drink water and urinate in time, and also have the habit of holding urine, which also becomes a trigger for urinary tract infections. This is because the retention of urine in the bladder can cause the proliferation of bacteria, which can lead to urinary tract infections. If women have the habit of washing their vagina after intercourse, this can damage the acidic environment in the vagina and trigger urinary tract infections. The main reason is that the acidic environment in the vagina can inhibit the growth and reproduction of bacteria, and when the acidic environment is destroyed, it can cause bacteria to proliferate, which can lead to urinary tract infections.