The first NSFW scene is between you and vines if you go too deep when gathering and has been in the game at least since 0.02 if not the very first release from 3 years ago. There is another one if you mess with alex's computer when you look around and a couple more with Ray and one with the ooze you can somehow get although i never did. All of these are on the corrupt path though, which is why i said you must not have played down that path. So far there are no NSFW scenes that im aware of that you can get yet on the good path for the characters.