When having intercourse, the male genitalia repeatedly rubs and irritates the back wall of the bladder, causing perineal tonicity, which can lead to difficulty in urination and pain. Since the urethra and the vagina are close to each other, if bacteria pass through the bladder during intercourse, it can cause urinary tract infections, which can lead to increased urination and painful urination. Due to the change of hormone level, there will be abnormal hormone level when having intercourse and it will cause bacteria to grow and stimulate the urinary system causing infection and pain during urination. At this time, you should drink as much boiling water as possible to flush the urethra to avoid really having inflammation of the urethra, and if necessary, you need to go to the hospital to register with the urology department for a routine urine examination and take oral medication according to the situation.