Right now, I think all NSFW scenes currently tie back to if you triggered the first one on day 1. I don't think there's another point where you can 'begin' the woohoo relationship yet. So if you wanna see them you have to move the pillow in Day 1 and go on from there.
But also keep in mind that the game is meant to be played without the NSFW, they're just a treat. :)