It enables people to choose when they want to have a baby.

A range of devices and treatments are available for both men and women that can help prevent pregnancy.

Some methods are more reliable than others. How well a method work often depends on how carefully it is used.

The contraceptive pill, for example, used correctly, is over 99 percent effective. However, because people make mistakes, as many as 9 women each year will become pregnant while using it.

This article will look at a range of methods of preventing pregnancy. It gives the actual rates of effectiveness, which take into account the possibility of human error.

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