That being said, I definitely like that you can't miss any scenes. This is a porn game, I don't see the benefit of being mid stroke then having to stop while I consider what direction to go. Having mini games to block progression is a fine way to add challenge. Specifically I don't see why a porn game should have you missing content, and why a developer would spend time making content you could miss.
Not that the game should have no challenge. But without a walkthrough, I like to know that I won't miss content. And I like that the options are labeled in terms of what you get to see (like Katara old vs young).