Myth 4: it is bad to have a foreign device inside my uterus

Not at all. The IUS has been studied and developed over many years and the clinical research has specifically evaluated this. If the IUS is inserted properly you should not even feel that the device is there.  You can have sex as normal, use tampons if you wish, and the IUS should not interfere in any way. If you have pain or you are aware of the device then it may be in the incorrect position and you can go back and ask your doctor to check.