There are some broad routes you can aim for but these aren't really fixed routes so you can select for Sophia to do whatever you want.
However you will find to get all scenes with some characters that you need to make certain choices to maximise points with those characters, and/or use the newish cheat mode to adjust character points. There are a few walkthrough's on Page 1 which will describe what you need to do for various broad routes.
In general we often talk about five broad routes with some exceptions below:
1) Goodwife route where Sophia is faithful to her husband but will include wife swapping later in the game.
2) Lesbian incest with daughter Ellie and/or sister Patricia
3) Lesbian non-incest with Alyssa and/or Nathalie and/or Vicky
4) Hetero incest with son Dylan
5) Hetero non-incest with (so far) Sam and Zac
Again these are broad routes - there is some overlap between them e.g. the first three or last four can be combined suject to some of the excptions below.
The exceptions to the above include:
a) Have to choose between two side jobs - the first Sophia helps out at nursing home with a couple of old dudes, the second Sophia is tutoring some YOUNG boys - choice depends on your kinks.
b) Have to choose between continuing Aiden's tasks (blackmail route) or sending Dylan away to boarding school (which opens up option of Dylan sleeping with next door neighbout MILF Amber).
c) In update V0.100 have to choose between going to Yoga with Ellie, Patricia and two others (to maximise Ellie route) or to go shopping with Alyssa (to maintain Alyssa route), both of which seperately lead to two of the hottest scenes in the game so far IMO.
So for example up until update V0.100, from memory, I was able to maximise points with all of Ellie / Patricia / Alyssa / Nathalie / Vicky / Dylan / Sam / Zac and then personally kept two saves for Ellie / Alyssa routes. Gives you a rough idea, but will probably need more saves going forward as the cominations of options proliferate.
) if he goes to the Boarding school or the incest path with sophie or Ellie or a normal romance Marie/Christine/Emma.
