The so-called safe period is the period other than the ovulation period. However, there is no absolute safe period in the menstrual cycle, as ovulation is affected by hormone levels and other factors, and may occur early or late. If you do not want to have children, it is advisable to take good contraceptive measures, as all unprotected sex can lead to unwanted pregnancy. Therefore, if you have intercourse during the safe period, it is advisable to use contraceptive tools. The more commonly used is the condom, the condom is more reliable, and the condom is also more effective in preventing sexually transmitted diseases, can block the occurrence of sexually transmitted diseases.