IUD made me extra moody at times, but not constantly, after a little over a year i actually became less moody than ever and loss of PMS except cramps. Everyone I know on Mirena has completely lost libido. My relationship is suffering terribly, i feel guilty, I'm sure your wife does too. Its not you, its the IUD. Maybe try female condoms or nonhormonal birth control, I know the copper IUD is nonhormonal but I do not know if it changes libido. Good luck!