Funny as I get a different vibe from it as being mostly relationship orientated. It's heavily path orientated, you can tell just from the walkthrough, so any 'to bang' option choice will or won't be there depending on prior choices. If you didn't treat them well or talk about the right things, it's not going to be an option.I seriously hope, but i doubt it too, the writing is not really relation oriented, i expect some more adventures with a quick bang if you get the right answer from a simple dialog.
What this doesn't have is the relationship stats game that bores me to tears. The most common, talk to her X times to get X relationship points to unlock scene. To me that's nothing about relationships at all (more about grind for extending content), what goes on during your adventures and the choices you make with them is.