Mirena
"I have had two kids, don't know if that effects insertion pain but it was literally a pinch, like when they take blood from your finger tip, not as horrible as some people are leading on. I had very light cramping for a few days and my periods became sporadic for a few months. I don't get a period anymore, might spot for one day every few months. I have not had one single problem with it. Its effortless. I don't have to worry about taking anything, getting pregnant or my period for a solid 5 years. Its fantastic."