>>> IUD and sex <<<

So im going on bc and I’m on the pill right now and might be switching to an IUD! There’s this one thing I’m kinda worried about.. my boyfriend and I have a lot of sex...sometimes rough too...are the strings from my IUD going to hurt/poke him and will rough sex do anything to the IUD??? Please help me out because if the iud is going to affect sex I’d rather just stay with the pill ya know