If your period is coming, but not yet, you can have sex. If there is menstruation, it means that there is bleeding in the uterine cavity, and such bleeding needs to flow out through the open cervical opening, and at this time, the cervical opening of the woman is open, and if you have intercourse, the bacteria can easily pass through the open cervical opening and enter into the uterine cavity through the vagina, which will in turn cause infection. Therefore, as long as the great aunt did not come, coitus is not a problem, menstruation is coming soon, but there is no bleeding, there is no problem, there is bleeding shows that the mouth of the uterus is open, sex is a problem, this is the principle of the problem. So, you can have sex when your period is coming soon but not yet.