Hmm a good question. Don't know if anyone tried this kind of a playthrough.
Some quick effect i can find in the script are, if Cindy's satisfaction is low early on she will refuse to give Ian a blowjob in Ch.10. Also, having higher satisfaction gives Ian option to eat Cindy out in that chapter.
For Alison, high satisfaction changes one of images in Ch.10. And if it's really high then Ian can make her bark for him in Ch.11
There's plenty of other small variations and differences, both for provided options and how the scenes proceed (or don't) But without some thorough digging don't know if there's anything really important it'd affect.