Final answer:
The most popular method of birth control among married couples in the U.S. is sterilization, which is a permanent method. Contraceptive methods vary in effectiveness, with methods like IUD being among the most effective. A 35% failure rate would not be considered particularly effective for a contraceptive method.
Step-by-step explanation:
The most popular method of birth control among married couples in the United States is sterilization. Sterilization is a permanent method of birth control that is achieved in males through vasectomy and in females through methods like tubal ligation. It is important to look at the failure rates and typical effectiveness when discussing contraception methods.
Looking at typical effectiveness of various contraception methods, arranged from least effective to most effective, we would have the following order: fertility awareness method, male condom, birth control pill, and intrauterine device (IUD).
If a contraceptive method has a 35 percent failure rate, it would not be considered highly effective. Effective contraceptive methods have much lower failure rates, meaning there is a smaller percentage of women who get pregnant during the first year of using these methods.