During menstruation and watching porn, the following three reasons can be analyzed from a medical professional point of view: 1. Physiological reaction, during menstruation or watching porn, women will experience pelvic congestion, which may lead to pain and tightness in the lower part of the body, which is relatively normal. 2. Vulvovaginitis, some patients have vulvovaginitis, due to the stimulation of inflammation of the vulva, which may lead to poor blood circulation in the vulva. 3. Vulvovaginitis, some patients with vulvovaginitis, due to inflammation stimulation of the vulva, may lead to poor blood circulation in the vulva, so the symptoms of tightness and pain. 3, vaginitis, clinically, vaginal congestion and edema, resulting in vaginal compression, which may affect the normal blood circulation, so tightness and pain in the lower symptoms. When such symptoms need timely medical examination and symptomatic treatment, usually also need to pay attention to personal hygiene, menstrual period need to change underwear diligently bath, so as not to lead to the invasion of bacteria and viruses, affecting the body’s recovery.