The most common reasons for stomach pain during intercourse are as follows: 1. the most common reason is chronic inflammation of the pelvis, long-term chronic inflammation leads to exudation of adhesions in the pelvis, so stimulation causes stomach pain during intercourse. 2. the stimulation of intercourse in the case of pelvic tumors can also cause painful sensations. 3. endometriosis, endometriosis can also cause pelvic adhesions during intercourse. 4. Once the pain in the stomach occurs during intercourse, go to the hospital in time to do an examination, according to the cause of the disease to be given treatment.