I have been reading all the side-effects women have been experiencing with the Mirena, and I just needed to add my two cents. I am a 28 year old woman, no children, very physically active, and I have had no problems with my mirena. I have had my Mirena in place for a year and a half. I have had no weight gain, no tenderness, no facial hair, no mood swings, nothing. The only side effects I have experienced are very light to non-existent periods. I have had my Mirena checked by my doctor regularly, just to be on the safe side. So, some women may experience negative side-effects, but others do not. I have been on several different types of birth control; the pill, the patch, the ring, natural planning, and now the Mirena and this is BY FAR the best method I have used. I feel for the women who have experienced negative side effects, but for me it's the one that works. Oh, and it did hurt having it put in since I have not had children. My cervix did not want to dilate, and it took two tries to get it in, but once in, I was good to go. Now my husband can be active any where at any time with no worries.