Condoms are a common contraceptive method used by young men and women today, and if used correctly, they can be 98% effective. However, if not used correctly, the contraceptive efficiency is only 80%. The reason for the incorrect use is the following: 1. Some young men and women combine it with the female safety period, thinking that this time is safer without condoms, in fact, this idea is wrong, because the female safety period is sometimes not safe, so if the condom is used, it must be used every time you have sex. 2. think that in the ejaculation and then put on the condom, not ejaculation is not used. This is also wrong because a small amount of prostate fluid has entered the woman’s vagina before ejaculation, and it can lead to pregnancy.