Marginal sex is a possibility of pregnancy. In clinical work, there are some women whose hymens are intact, who have delayed menstruation and whose gynecological ultrasound indicates early intrauterine pregnancy, and most of these patients are triggered by marginal sex, so marginal sex is not safe. As long as the sperm meets the egg at the right time to form a fertilized egg and plant it in the uterine cavity, a pregnancy will be formed. At the same time, you can use oral contraceptive drugs or men wearing condoms for contraception.