1) By final Tarzan scene, do you mean his last lesson? If not, then you need to progress with another character to unlock it (Spoiler Warning: Merida)
2) To unlock Belle's storyline, you need to buy an item from the Shadowman's boat. I'd recommend downloading the newest version of the game, just to be safe-- I came across a bug somewhat recently that could skip the trigger for his shop opening, but that should be fixed now.
3) What monkey scene? The wall scene is a part of Belle's storyline, but I can't figure out what the first one refers to.
4) Not likely to be any impreg content, but more bdsm is always possible. Don't have anything against it, but I don't see it coming into any chapters I have planned.