I agree, if things are serious it will affect every aspect.
We rarely disagree or argue...and we've never had make up sex or "grudge fuck" because we get over things quite quickly. Neither of us are the type to stew over things, or let things linger for even an hour, never mind days. So for us arguments/disagreement s have had zero effect on our sex life so far (8 years later). But I don't get the feeling that we're the "norm" on that end!