Women should not have intercourse during menstruation. Intercourse during menstruation can cause serious consequences, which can lead to pelvic inflammatory disease. Patients with pelvic inflammatory disease will experience lower abdominal pain, lower abdominal cramps and anal cramps. If pelvic inflammatory disease is not actively treated for a long time, it will turn into chronic inflammation, which will lead to inflammation of the fallopian tubes, resulting in blockage of the fallopian tubes and affecting fertility afterwards, and intercourse during menstruation will lead to endometriosis, which will form ovarian chocolate cysts if ectopic to the ovaries, thus affecting ovulation and fertility. If the endometrium is ectopic to the myometrium, it will form adenomyosis, which will affect the development of the uterus, resulting in uniform enlargement of the uterus and uneven rebound of the uterine muscle wall, which will lead to infertility due to the impact on the blood flow of the uterus. The consequences of prolonged intercourse during menstruation are very serious, it is recommended not to have intercourse during menstruation, if there are serious consequences need to be actively treated according to the situation.