sex with iud?

i have had my iud for about 3 years now and there are certain positions I cannot do because of sharp pains also i cannot take the d deep. does anyone else have these issues. i spoke to my OB and she said my iud is in perfect position. I get angry when my bf tells me I cant enjoy sex every single time because of pain bc i don't think its true but he said he feels it. what do you girls think?