There are many kinds of contraceptive methods, please be sure to choose the scientific, effective, and suitable for you. Do not easily try those unreliable contraceptive methods, so as not to suffer physically. 5 kinds of scientific contraceptive methods: 1, the use of male condoms male condoms, is the most common, but also the least side effects of male contraceptive measures, not only can contraception, but also effective in preventing sexually transmitted diseases. Especially suitable for partners in love, and menopausal women use. As long as the condom does not break during use, its contraceptive effectiveness can reach about 99%. 2, oral contraceptive pill Short-acting contraceptive pill is a more mature and efficient method of contraception, the efficiency can reach 99.96%, most healthy women are suitable for short-acting contraceptive pill; and long-acting contraceptive pill due to strong and large amount of drugs, easy to affect menstruation and weight, not suitable for women who have not had children. 3, placement of intrauterine device Placement of intrauterine device is a relatively long-acting, worry-free contraceptive measures, but also a reversible contraceptive tools, for women of childbearing period without contraindications. It is recommended to perform IUD surgery within the 3rd to 7th day of clean menstruation. 4, subcutaneous implantation method of contraception subcutaneous implantation method of contraception is the progestin contained in the skin implantation agent implanted in the body, which can regularly release progestin, so as to achieve the effect of contraception, the success rate of contraception can reach 98% -99% or so. But subcutaneous implantation also has certain side effects, easy to lead to fluctuations in the body of women’s hormone levels, thus causing abnormal vaginal bleeding, breast pain, nausea, vomiting and some other adverse reactions. 5.Ligation surgery includes bilateral tubal ligation surgery for women or vasectomy for men. Ligation is an effective sterilization surgery, using certain means to tie up or cut off the female fallopian tubes or male vas deferens, effectively preventing the combination of eggs and sperm, in order to achieve the purpose of contraception. This is a permanent form of contraception and is more suitable for women who do not have a requirement to have children. 3 unreliable contraceptive methods: 1, in vitro ejaculation First, in a few cases, the secretions before ejaculation will also contain a small amount of sperm; second, if the distance from the vaginal opening is very close to the time of in vitro ejaculation, a few sperm will also sneak into the vagina, resulting in a hit; finally, who can guarantee that every time can control the in vitro ejaculation? 2, safe period contraception Safe period is not necessarily safe. If women have irregular menstrual cycles, can not accurately calculate the safety period, often leading to contraceptive failure. In addition, ovulation is also susceptible to change by the environment, diet and other influences. 3, emergency contraceptive pills Emergency contraceptive pills are mostly used for remedial measures that have to be taken after an accident. Take the pill within 72 hours of unprotected sex, and 12 hours later can make up a pill. Taking the emergency contraceptive pill will affect women’s menstruation to a certain extent, and this type of contraception often has a high failure rate, and is not very reliable. Although there are many methods of contraception, some survey results show that the use of contraceptive measures among young women is very low, only 13%, and the use of in vitro ejaculation and safe period methods lead to the failure of contraception accounted for 75%. Unreliable contraceptive measures, resulting in abortion, often cause both physical and psychological damage to women, so it is important to choose a scientific method of contraception. References: [1] Wu Jiu-ling, A study on the knowledge, behavior and attitude of contraception among unmarried young women with induced abortion in Beijing. Chinese Journal of Epidemiology,2001,22(3):219-222.