It is recommended that you have intercourse after your period clears. If your period does clear, you can have intercourse one day, but be careful with contraception. Some people will have their period clean today and may have brown discharge or menstruation again tomorrow. Therefore, it is better to have intercourse for three days to avoid the possibility of inflammation. If the period is not clean, or if the period seems to be clean, but comes again in this case, the bacteria on the male body, may be infected upward through the open uterine opening, leading to inflammation of the genitals.