Watsup posted the choices to enter Grace's route
here. The other routes are pretty straightforward imo; I was able to just fumble around and make decent guesses for Marion and Jessie to lock onto their paths, but Grace's really stumped me at the time.
I
think someone has an old post in this thread somewhere with the exact choices for the other two girls if you're really that stuck; I'll try to find it and edit this post if it exists and I do spot it.
Edit: Alright I read through the entire thread. There was never a full guide here, so I guess I lied. All I can offer as a walkthrough or guide for Marion and Jessie is to just pick the positive choices that best match their personalities, I guess.
Marion is more conservative in the sense that she likes the traditional farmer/rancher life and wants to stick with what's familiar. She's not necessarily shy, but definitely a little more reserved.
On the other hand, Jessie is all about embracing the new and trendy. She's much more outgoing and daring, wanting to go see the world and be a part of the cutting edge of culture while leaving most of her traditions and roots behind.
Just pick choices that are positive and/or play into these traits the best and you should be well on your way to Marion and Jessie's routes. Can't be that hard if the forum with a bunch of horny idiots can pull it off without getting a guide, lmao
