Final answer:
Contraceptive methods with less than 1% pregnancy rate include hormonal implants, IUDs, and sterilization through vasectomy or tubal ligation. These methods are highly effective when used perfectly and they offer a reliable means of preventing pregnancy.
Step-by-step explanation:
There are several effective contraceptive methods with < 1% pregnancy rates when used perfectly. These methods include hormonal implants, intrauterine devices (IUDs), and sterilization procedures such as vasectomy and tubal ligation. Implants involve the insertion of a hormone under the skin to prevent ovulation. IUDs are devices inserted into the uterus which create conditions that hinder implantation of fertilized eggs. Both methods have a failure rate of less than 1% with perfect use. Sterilization through vasectomy or tubal ligation is a permanent measure that also has a failure rate of less than 1%. It's important to note that while these methods are highly effective at preventing pregnancy, they may not protect against sexually transmitted infections (STIs) except for condoms, which also offer STI protection.