A copper Intrauterine Device (IUD) can be used after unprotected sex to provide emergency contraception. The IUD is a small object that is placed in the uterus; it must be inserted by a trained medical practitioner. The IUD is more effective than emergency contraceptive pills (preventing over 99% of pregnancies) and can be left in place for as long as ten years to provide on-going contraception. It can be inserted up to a week after unprotected intercourse.

IUDs should not be used by women who are at risk of sexually transmitted infection (because they or their partner have other partners). Getting a vaginal infection while using an IUD can increase the risk of pelvic infection, which can lead to infertility. For women at low risk of infections, the IUD is a very safe contraceptive method.