Toxic shock was with tampons. As for IUDs, years ago there was a faulty study that linked them to possible infertility. Now it is an accepted fact that the study in question was flawed. I just read an article on birth control earlier this evening that said the IUD is the most effective, underutilized form of birth control. I actually had one myself for years before I got my tubes tied and never had a problem.
I don't know but I am not sticking one in my weenie to find out !