What it is: After being taken off the market for many years due to related health risks, the relatively new IUD is a T-shaped device inserted in the uterus by a health care provider. It can last up to 12 years.
How it works: The hormonal version is an ovulation-inhibitor, preventing the release of an egg from your ovaries that, when fertilized, gets you pregnant. As for the copper (non-hormonal) version, Herbenick says it’s not entirely understood how it works, but the copper essentially immobilizes sperm from traveling up your vagina.
Effectiveness: More than 99 percent
STD Protection: None.
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