Breach of Decorum

I don't want to seem like I'm obsessed with my roommate's sex life, but...

First, let me say I'm completely fine with my roommate having sex, especially since he has it in his own room. I don't even mind that it's loud, or happens late at night; the walls are nicely insulative, and I'm usually up anyway. I'm just mortified about my own activities when the sex is happening. If I were having sex, I'd want to be as little a nuisance to my roommate as possible. Therefore I'd rather he be walking around going about business as usual rather than, say, putting on headphones or locking himself in his room or whatnot. So I tend to act as though nothing's happening. But then I worry that my activities might be loud and annoying when my usual business at that moment is, say, washing the dishes or taking out the garbage or tromping around on the creaky floorboards in hiking boots. Is this taking casualness too far?

Which leads me to my final question, which is pressing since the roommate is mid-coitus: Would practicing the banjo while he's performing in his carnal carnival be stepping over the line that separates "casual indifference" from "passive aggression?"