Pain in the genitals after sex may be caused by localized injury, urethritis, prepuce glans, vaginitis and other factors. 1. Localized injury: Excessive force during sex may lead to localized damage to the penis or vagina, which will lead to symptoms of pain in the male or female genital area after sex. 2. Urethritis: when suffering from urethritis, during sex, due to the urethra will be squeezed, may make the infection aggravated, after sex will appear pain, may also be accompanied by frequent urination, urinary urgency and other symptoms. 3. Gonorrhea: If a man suffers from gonorrhea, it will cause irritation during sex, which may lead to localized pain in the glans after sex. 4. Vaginitis: Women with vaginitis, such as bacterial vaginitis or fungal vaginitis, can also lead to vaginal pain after sex, vaginal bleeding, vaginal itching and other symptoms. There are many reasons for genital pain after sex, and it is recommended that you seek medical attention for appropriate examination and treatment.