Using a condom in the middle of sex is not a standard method of contraception and has a higher chance of causing an unwanted pregnancy. If a condom is used in the middle of sex, it may not be effective. The condom should be used in a standard way to achieve the contraceptive effect, from the beginning of sex should be worn correctly, before wearing also check whether there is a breakage, leakage. At the same time, when you take it, you should also pay attention to not let the sperm leak into the vaginal opening, so as not to cause pregnancy. Only regular use of condoms can achieve the effect of contraception, if the use is not standardized, the effect will be greatly reduced.