I had the Mirena put in after I had my daughter. It was great for me for the longest time! I didn't notice any weight gain (although I just had a baby). Sex wasn't any different. My boyfriend would complain about the string hurting him if he didn't wear a condom so I had the string shortened. But after about a year I noticed frequent UTIs and yeast infections. A year after that, my boyfreind hit it wrong or something. I went to the dr. and they said that it was still in place but I've had painful sex ever since if he goes too deep or rough. I had it removed and I still have pain problems. Does anyone else have the same problem?