I have never had kids either and I don't ever intend to. That is another reason why I chose the paraguard. See I am the complete opposite, I have had absolutly no cramps with mine, and my periods stayed the same as before I had it inserted.I've had the paraguard for a year. It is terrible. My cramps have been so bad that I've thought I was going to pass out. Most of my periods are very heavy and last almost ten days. I have to get this thing removed. I was told it would get better after a few months, its only gotten worse.
I suggest caution with this, especially if you've never had children (like me).
Everyone must try it for themselves first, because everyones body takes things differently. You will never know unless you try.