Nothing is perfect: But most common reason for contraceptive failure is due to improper use. All approved contraceptive medications and devices are very effective (greater than 90% effective when used properly). Reference: http://www.Nhs.Uk/conditions/contraception-guide/pages/how-effective-contraception.Aspx some have higher failure rate because they are more prone to improper use. That is the main factor.
Answered 4/21/2014
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