You can’t have intercourse when you’re menstruating. 1. For women, in the menstrual period, estrogen and progesterone retreat, endometrial stripping bleeding, blood vessels open, cervical opening, during this period of coitus, easy to cause infection, serious gynecological inflammation, resulting in abnormal secretions, abdominal pain, lumbar pain and other discomfort. There is also the fact that coitus during menstruation is more likely to get endometriosis, which can lead to progressive aggravation of dysmenorrhea, and serious menstrual disorders. These conditions are serious and can easily affect fertility, so you can’t have sex during menstruation. 2. For men, in the female menstruation, the blood of menstruation, in the process of coitus, it is easier to enter the male reproductive tract, which will cause some irritation of the male urethra, leading to discomfort. The menstrual period can not cohabit, it is recommended that the menstrual period pay attention to good hygiene care, avoid cold spicy stimulating diet, avoid labor and cold, to ensure that successfully through the menstrual period.