When I was diagnosed in June this year I had had a mirena in for 18 months. My bc surgeon insisted it was removed ASAP as she said she believes it contributed to my cancer. My OB has said I will never be able to use anything like that again ( tamoxifen should put me into menopause anyway) and definitely can’t use any other hormone type drugs etc. I hadn’t had any problems with in while it was in. I did have to have it surgically removed in theatre though as the cord had flipped backwards and couldn’t be felt while I was awake. I wouldn’t go ahead with it and would encourage your husband to research having a vasectomy.