The four clinically safe, effective and feasible methods of contraception include the oral short-acting pill, the IUD, condoms and ligation. For people who do not need to have children, ligation is the safest and most effective form of contraception. However, there is one disadvantage: if you want to have children again, you need to use IVF or have a recanalization procedure to achieve the purpose of having children again, so the reversibility is poor. The other three relatively speaking, if you do not want to take oral short-acting contraceptive pills, the more effective contraceptive method is mainly the IUD, the success rate of contraception with the IUD is 98%, while wearing condoms, because sometimes the use of methods are not particularly accurate, the effectiveness of contraception will be greatly reduced. The success rate of contraception is 96% if the device is used throughout the whole process and does not break. Between IUD and condom, the main disadvantage of IUD is that it is easy to cause inflammation and affect menstruation, for example, some people tend to have heavy menstruation and irregular bleeding after IUD, while wearing condom has less side effects, mainly because some people find it troublesome to wear condom.