Common contraceptive methods in general: The first is the IUD, with the copper IUD being the most widely used, for women of childbearing age who do not have an emergency certificate. Another is the carrier contraceptive pill, which is composed of estrogen and progestin and is more suitable for women under 35 years of age who do not smoke. There is also an emergency contraceptive method, which is used for one-time, unprotected sex, namely the oral emergency contraceptive pill, which is not a substitute for regular contraception. Another is the condom, or penis condom, which has a higher contraceptive rate and also has the effect of preventing sexually transmitted diseases, and is more suitable for promotion. Safety-period contraception, also known as natural contraception, is not very reliable and should not be promoted. In addition, there are some contraceptive methods, such as vaginal condoms, and external spermicide these methods.