My SO didn't trust that my IUD would keep me from getting preggers. Not that he was upfront about it either. Guh. Men. Maybe it would help if he could do some reading up on it himself? Might that sooth his concerns? I sent my SO a couple websites that talked about it, and not too long after he seemed to be better about it. At this point he doesn't seem to mind at all. He just needed some reassurance I think, that it was an effective means of birth control. I will admit, it can seem a little odd to trust a little scrap of copper to keep you from getting preggers.