The actual fact is that there is a 30% chance that you will get pregnant even if you have an external ejaculation during intercourse. In the event that the penis pulls out of the vagina quickly during orgasm or when ejaculation is imminent, a small amount of semen will be discharged. Even in the vulva area, it is not excluded that sperm will enter the uterine cavity, and the prostate gland also contains a small amount of semen, which can also enter the uterine cavity through the cervical canal, where the sperm and the egg combine to form a fertilized egg. In vitro ejaculation will cause the sexual nerves to atrophy and weaken causing premature ejaculation, impotence and other symptoms, and can even cause central nervous disorders, which over time will lead to sexual non-ejaculation. If there is no plan to have children, it is best to take contraceptive tools for contraception, men are recommended to use condoms, women can choose to place an intrauterine device, if necessary, you can go to the hospital to check to prevent contraceptive failure.