Can the IUD come out during sex/fingering?

I read that the way the obgyn takes out an IUD is by pulling it through the strings so it comes out. If it's that easy to pull out, if I have rough sex and my boyfriend goes really deep in me all the time and also fingers me, could it be possible for him to accidentally pull the strings? I know it's in your uterus but the strings are touchable so I'm just worried about it