The definition of safe sex is safe and effective sex when a woman is not ovulating. Theoretically, the safe period is the first 14 days after the end of a woman\’s menstrual period and the last 4 days before the next menstrual period. During this time, women are not considered to be ovulating, and men do not have to worry about pregnancy if they have sex during this time. Advantages of safe sex Compared with other contraceptive methods, safe sex has many advantages. First of all, it is a natural method of contraception that has no negative impact on women\’s health. Because it does not require the use of drugs to regulate hormones; no need