The most common causes of hot and irritating pain in the vagina during sex are a break in the vaginal wall, or vaginal dryness and polyps in the vaginal wall. If the vaginal wall is partially broken during sex, when the penis enters the woman’s vagina, it can cause irritation to the broken skin, resulting in a painful sensation. If the vaginal discharge is low during sex, the pain may be caused by the increased vaginal friction. You can check the white belt routine to see if there is vaginal inflammation, and check the hormone 6 test to see if the estrogen is low. If there are polyps in the vaginal wall, the pain may occur due to the pressure on the polyps during sex.