Not sure what you mean, so I'll clarify how this game works:
IW is split up into chapters. This made more sense when releases more or less put out an entire completed chapter at a time and happened every few months - this stopped being the case, so the whole chapter system is kinda pointless besides acting as checkpoints. Now, releases include a lot of work on new content in the most recent chapter/new chapters, and also some revision of outdated older chapters.
Currently, we have:
Act 1, with chapters 1-5. Some of Act 1 is kinda disjointed because 1-4 haven't changed much since the beginning, whereas 5 is very different. You only start getting the barest hint of anything erotic in Chapter 4, and Chapter 5 basically features a lot of stripping and peeking on people stripping (with the notable exception of Ginny).
Act 2 currently only has chapter 1. This is where the bulk of things which aren't "watch these same characters strip under slightly different circumstances" come into play.