Final answer:
Abstinence is the only contraceptive method that is 100% effective at preventing pregnancy. Other methods, including condoms, birth control pills, and tubal ligation, have varying effectiveness rates, often influenced by real-world use versus perfect use.
Step-by-step explanation:
The question posed is concerned with contraceptive methods and their effectiveness. Abstinence is the only method that is completely effective at preventing pregnancy, with a 100% effectiveness rate. Other methods such as condoms, birth control pills, and tubal ligation vary in effectiveness. While tubal ligation and vasectomy are considered permanent forms of contraception, other methods like hormonal pills, intrauterine devices (IUDs), and barrier methods like condoms are reversible.
It is crucial to understand that the effectiveness of any contraceptive method is often reported in terms of typical use and perfect use, with failure rates typically being higher in real-world use compared to controlled, perfect usage scenarios. Additionally, compliance with a contraceptive method plays a significant role in determining its success or failure rate.