What contraceptive technique is effective in preventing pregnancy?

While the barrier method can indeed reduce the likelihood of pregnancy by preventing sperm from reaching the egg, it is not considered the most effective contraceptive technique when compared to others.

The copper IUD, a form of intrauterine device, is highly effective and can prevent pregnancy for up to 10 years after insertion. It works by creating an environment in the uterus that is toxic to sperm and eggs. This method is recognized for its efficacy in preventing pregnancy.

Hormonal implants are also highly effective, providing long-term contraception for several years. These implants release hormones that prevent ovulation, thicken cervical mucus, and thin the uterine lining, further preventing pregnancy.

The withdrawal method, while a strategy some may use, relies heavily on timing and self-control, making it one of the least effective methods, as it does not provide reliable prevention against pregnancy.

In summary, while the barrier method has its benefits, contraceptive techniques like the copper IUD and hormonal implants offer higher levels of reliability in preventing pregnancy.