When there are brown secretions after having sex, it may be that the action is too intense when having sex, which results in contact bleeding. Observe the leucorrhea. If this phenomenon occurs every time after having a roommate, it is recommended to go to the hospital for gynecological examination in time to eliminate the possibility of cervical diseases and deal with abnormalities in a timely manner. If you have sex just after menstruation, it may be residual menstrual blood. If you have sex during ovulation, it may also be caused by bleeding during ovulation. Don't worry too much. You should supplement more nutrition every day to increase the body's resistance, ensure adequate sleep, avoid excessive fatigue, pay attention to the cleanliness of the vulva, and avoid having sex during menstruation.