The strange thing is that before I saw the post about the codes for endings, I did a playthrough picking all the choices that distanced myself from the characters other than "karen". But that also wasn't sufficient to get a "non-bad ending" which is feel is rather badly designed, especially as we don't have any information on what sort of points are necessary and when we get the points necessary.
You also don't feel any impact of "lacking points" for the scenes until the ending, which is rather silly, I did my best to ignore Nikki, but even then I had to go through the anal scene, even though I said no, and karen caught me -> bad ending.