My new guy is quite well endowed (and I love it) but the first time we were together, he managed to get some hella painful cervix stabby action happening. I've had this happen before and it was no where near as painful as this one time. The difference is that I now have an IUD. With the IUD in place, do I need to be concerned about him "bottoming out" and it affecting me negatively (i.e. knocking it lose, puncturing something, etc), or just have to worry about the ouchy ness it causes?