What is the code that appears in the settings?
as per the change log
"Apart from the new content that simply cover the events of the day, it also incorporates a new mechanism which is part of a wider plan to tailor the game to people's individual tastes.
Up until now, there was a simple "Vanilla/Kinky" option at the start of the game, but a new game would give a wider range of ranging options from none (0) to extreme (3).
Loading a pre-existing game that doesn't already have a custom level will default to Moderate (level 2).
You can override this by hitting Escape, selecting "Enter a code" then entering "Fetishes" as previously described. You'll be prompted to enter the new level and you should save."
Aside from that I think it was used as like a debug option from the dev.