MASSDEVICE ON CALL — Intrauterine devices and contraceptive skin implants are more effective and require less maintenance than condoms or birth control pills, but the vast majority of women stick with the more traditional methods.

Intrauterine devices, which release small amounts of either copper or progestin in the uterus to prevent pregnancy, amount to less than 6 percent of contraceptive use. The skin implants were only approved in 2006, so less is know about their use.