Like all contraceptives, a condom does not provide perfect protection against pregnancy. Pregnancy despite a condom can be attributed to application errors (wrong size, wrong covering, damage during unpacking) and, occasionally, material defects. These cause the condom to tear or leak. The so-called Pearl Index for condoms is 2-12, i.e., between 2 and 12 in 100 women who use this method of contraception exclusively for a year become pregnant.