If a condom is used regularly, the probability of safety is about 95%. If a condom is found to be broken or slipped during the use of a condom, the probability of contraceptive failure is relatively small, less than 5%. However, if you do not use condoms regularly, such as when ejaculating with condoms, or do not use condoms throughout the contraceptive method is wrong, the probability of pregnancy is still relatively large, for example, the probability of pregnancy during ovulation may reach about 60%. So condoms must be used in accordance with the regular method of use, the whole condom contraception, and afterwards must check whether the condom is broken, and in the middle of the condom must check whether the condom has slipped off.