As far as I'm aware the devs are aiming for the game to be very free-roaming and non-linear, which I suppose makes it harder to plan out stuff like that. Though frankly I don't think it's THAT hard to have an option that simply cuts out/prevents the NTR from happening if you toggle the option.
My personal opinion is that the 4 classes need some major rework, since the Priest and Sorcerer class are horrendously underpowered compared to Swordman and Knight, and Sword/Knight aren't exactly heavy-hitters either. Swordman definitely needs a more creative name for it's first unlocked TP move besides "Strong Attack".
Some enemies in the forest, like the wolves, take 20-25 turns to beat as a solo Swordman/Knight with the best equipment available at level 6. IMO 25 turns per encounter is beyond unacceptable for a basic enemy type. I could easily imagine solo Sorcerer/Priest entering 30+ turns. Since getting a party isn't considered 'mandatory' by the devs (which, by the way, really kneecaps the story/interaction, since encounters are now no longer designed with the party members in mind, meaning you can't have any sort of organic dialogue/sitations pop up to learn more/bond with these characters) I'd suggest some kind of "loner" scaling bonus, so the PC will do more damage if he doesn't have a party.