Least effective method of contraception

Answer 1

The US Center for Disease Control (CDC) has compiled statistics on various methods of contraception, and their success rates. Most methods must be used correctly every time in order to maximally effective.

Effectiveness (from least to greatest):

71-82 % Spermicides alone

79-95 % Female condom

75-99 % Fertility awareness planning ("the rhythm method")

85-98 % Male condom

94-94 % Diaphragm or cervical cap

92-99 % Oral contraceptives ("the Pill")

92-99 % Mini pill

92-99 % Hormone release patch

92-99 % Hormone release vaginal ring (the NuvaRing)

97-99 % Hormone injections ("the shot")

99 % Subdermal implant (aka "Norplant")

>99 % Copper T IUD

>99 % Mirena IUS (hormone release IUD)

100 % Total abstinence

A combination of male condoms and spermicidal lubricant is often recommended since it is easy to use, doesn't require advance preparation, and can be obtained without a doctor's prescription.