Whether you can use gel after sex, you need to judge the type of gel, if it is a gel for vaginal inflammation can be used, but if it is a contraceptive gel, it will not be effective after sex. The use of contraceptive gel for contraception is now a relatively new method of contraception, which can ensure the pleasure of sex at the same time, but also play a very good contraceptive effect. Used before sex, applied to the female vagina, the main role is to effectively kill sperm, can prevent sperm from entering the female uterus, the success rate of contraception can reach more than 95%. If sex has ended, the use of gel is not useful, because during sex, sperm can normally pass through the vagina into the uterus, there is no contraceptive effect, so if it is a contraceptive gel, certainly can not be used after sex.