Sex is not allowed during menstruation, during menstruation, if sex may cause endometriosis, or obvious abdominal pain. The nature of women’s menstruation is caused by the shedding of the uterine lining, during menstruation there is a large amount of bleeding, if you have sex at this time, although the use of condoms, because in the process of sexual intercourse, the penis for the vaginal pressure, may cause the menstrual blood reflux, may cause retrograde infections, in the process of sexual intercourse, the sexual stimulation may cause the uterus to contract abnormally. If there are significant contractions of the uterus during menstruation, it is possible to cause significant abdominal pain, with significant changes in the amount of menstrual bleeding. Sex is not allowed during menstruation regardless of the use of condoms, or without condoms, in order to ensure good health.