Condoms are the most common form of contraception, with an effective contraceptive rate of 93% to 95%, and they can prevent sexually transmitted diseases if used correctly throughout the entire process. It is necessary to pay attention to the correct use of condoms in order to have effective contraception, otherwise abortion after pregnancy can damage the reproductive health of women. First, blow on the condom before using it to see if it is broken and to expel the air inside the small sac. Secondly, must remember to pinch the condom mouth together with pull out after ejaculation when the penis is not yet soft and shrunken, to do the whole use. In addition, be sure to choose the right type, too big or too small will affect the effect.