You can’t have sex when you have your period, because a woman’s period is the shedding of the uterine lining, which passes through the open cervical opening and out of the body through the vagina. At this time, the cervix is open, so if you have sex, bacteria can easily enter the uterine cavity from the vagina through the open cervix and cause inflammation in women. During menstruation, the woman’s uterine cavity because of the accumulation of blood, if there is bacteria to enter, it is also very easy to cause infection. Therefore, you should never have sex when you are having your period. It is also best not to eat cold, spicy and stimulating things when your period is coming because these foods can easily lead to prolonged menstrual periods.