When the IUD first came out, there were more problems with it because it was a new method of birth control. However, it's been around... what, thirty or fourty years, and in that time they've perfected both the IUD itself and the methods of insertion and removal.
http://www.iud.com/
Do check out the "IUD-What do you Know" thread, as it's got a good chronicle of my expierence with getting an IUD, and other's exierences as well. IUD's are the preferred method of BC in many other contries around the world, just not in the US for some reason.
__________________
Sage knows our mythic history, King Arthur's and Sir Caradoc's
She answers hard acrostics, has a pretty taste for paradox
She quotes in elegiacs all the crimes of Heliogabalus
In conics she can floor peculiarities parabolous
-C'hi