Condoms can be used as a contraceptive first of all, if they are used throughout the whole process and withdrawn from the vagina together with the penis after sex to avoid the sperm inside the condom from entering the vagina, it can be 100% effective. Condoms can also help to avoid sexually transmitted diseases such as trichomoniasis, chlamydial vaginitis, AIDS, mycoplasma infection and HPV infection. However, some men do not like to apply condoms because they feel that it will affect the sexual pleasure, compared to the benefits of condoms or should overcome and take this safe form of contraception. Condoms can choose ordinary condoms, but also functional condoms. To choose the right size condom according to the size of the external genitalia, to avoid too big or too small to affect the experience of using. In addition, it is important to apply condoms from the very beginning of sexual life, not halfway.