I see ppl here posting how to turn NTR off (if you agreed with NTR at the beginning of the game) in the bedroom but thats not how it works.
ON means "hardcore" coz you loose 20 relation with every girl every night.
OFF means "soft" coz you loose only 10 relation with nicole,5 with other two girls you live with and 3 relation with the rest...its just easier to build up relation with gifts and decisions you make on a daily basis to avoid NTR situations.. If you dont watch out,relation can still drop to near zero and then the NTR can encounter for that specific girl.
NTR is still active.
If you want to disable NTR entirely,you must do it at the beginning,and only then!