Frequent sex can cause delayed menstruation. Frequent sex can cause women to become emotionally stressed or overly aroused. Emotions can affect the hypothalamic-pituitary-ovarian axis in women, and so can affect their menstruation. Emotions can affect menstruation by either pushing it back or making it early. Having sex more often than a woman’s body can handle can have an effect on her body and lead to a decrease in her physical condition. This can cause a delay in menstruation and may be accompanied by a decrease in menstrual flow. Under normal circumstances, most women have sex 2-3 times a week is normal, more than this frequency should be judged according to the woman’s ability to withstand, whether sex is too frequent and whether it causes damage to the patient’s body. Although frequent sex can cause a delay in menstruation, the possibility of pregnancy must be ruled out when there is a delay in menstruation. Because sex is too frequent, the chances of unwanted pregnancy are still very high if contraception is not done properly.