sex with the mirena

so my boyfriend and i had actual sex (not just a quicky) this past weekend and when i’m on top or he’s on top he says he hits “it” and he says it hurts?? i’m guessing he’s hitting the mirena because he does have a relatively large 🍆. sorry for the tmi😂. but anyways i was wondering if there’s anyway for it to not “hurt” him and still have a normal sex life.