Copper
"If you are like me and DO NOT want to be on any hormonal meds, this is for you!  I've never had children and it wasn't that painful getting inserted. It's very quick, comparable to a pap.  I was sore internally for maybe a day while my body adjusted. The periods are a different story: My first couple periods were extremely painful and lasted longer than normal. However, they ARE getting less severe every month. I'm going on month 6 and this month was like a normal period again.  My advice is to deal with the pain for the first few months because it will level out."