mirena sexual side effects

I started the Mirena two months ago and have had a lot of trouble reaching an cllmaxing. This started in the past two weeks. I have never had trouble before - in fact, I can cllmax several times to my husband's one. Has anyone else had this problem? Does it go away with time? I enjoy sex immensely and am not willing to give it up for an IUD. If it will go away with time I'll hang in there but if this is what I have to look forward to for the next five years, I don't think it's worth it. Please give advice. Thanks