I recommend giving chapter 1 a try. I don't know what that guy is talking about, but I have played through 3 chapters with NTR off and none of the girls seem to have a wandering eye.
None of them talk about sharing, or swinging, that I remember.
There is an option in chapter 2 after you stole his pregnant wife away, to let your Dad come back for some fun, but you don't see it, and she was his wife originally, so maybe throw him a bone?
There is another lady whose son is perving on her, and you can help him bang her, but again, you don't see it. It's also possible to ignore sexy time with those ladies entirely.
I think it is a fun little incest harem game, and by far, enjoyed chapter 1 the most. There is also plenty of romance with family members, and some other girls as well.
In future chapters Max becomes a Pimp/strip club owner and sort of a gangster, and most of the wholesomeness goes away, though he still treats the ladies well in my opinion.