I found this after I posted my question above. This is almost a year old, but maybe this answers my question. Maybe the differences in sexual content, if there are any, are purely related to how the repeatable scenes evolve after repeating them.<SNIP>
And now about the restrictions for the VN mode. I'll tell you right away that there won't be many restrictions. Although I wanted to add VN mode as an easy mode, without hardcore at all.
On the storyline will be unavailable very little, but it concerns mainly deep branching. Truthfully I'm still in contemplation if this restriction is necessary. So if I find a way to quickly isolate some of the content, I will add all story content to VN mode. No restrictions.
Well, repeatable events, can't be in VN mode. Do you see why or not? In Sandbox mode, at a certain point in the story, you will have a girl available to you at a certain time and place. You can go to her and do to her what she allows you to do to yourself at that point. As you progress further in the same repeatable event, new actions will be unlocked. For example, you got to anal with her in the story, so anal sex with her will open up for you in that event as well. Plus I will add different poses for already available actions and so on. So now tell me, how do I do that for VN mode?
<SNIP>
In the current state of the game, I don't think there are any scenes like that, right? So as of version 0.5, are the VN scenes and the sandbox scenes the same? I assume yes, but let me know if I'm wrong.