I have had the copper IUD since I was 20 (4 years) and I've never had children. Apart from passing out from the pain from the insertion, and then the first 18 hours of miserable cramping, I've had no side effects and I'm totally happy with it. When I was getting it my doctor explained that most of the common "concerns" associated with IUD's are from problems that occurred in the 70's but there have since been changes made and there are few risks.