Because they are hetero sex scene and do not involve abuse?
You are right.The sex scenes between Nayeon and Noah are pretty boring.
They don't play any part into the progress of the story.
I like the scenes even if they don't progress the story i enjoy seeing them
@Akira LOL you think I don't like hetero sex scenes, or ones that are vanilla? Some of my favorite manga are full of consensual, non-kinky opposite-sex relationships, i.e. Mars; Paradise Kiss; Red River. Miss me with that 'oh I got you alllll figured out" shit. You don't know me, babe. (︶_︶)凸
the author managed to make the sex scenes boring and stale. Don't know how they pulled it off, but they did.