I can say that the choices you make will determine what your wife does. If you treat her poorly, or cheat on her yourself, then there is a chance that she will do the same to you. There may not be a hard Yes or No choice to keep things from going too far, but there are choices that will determine whether they do or not.
We are planning on 'solo' scenes with the wife, but if you are a good husband, then you will have a choice in having those happen or not, and would be informed of them happening.
The choices are what determines how the relationship goes. As I said in an earlier post, there are some scenes that are 'setups' for possible paths in the future, and are also there to show the personalities of the characters. Much like the old neighbor scenes. Or the roleplay scenes. Those are there to build the choices that have been, or will be, made. The blackmail scenes are also a setup for what is coming in the future, and it will be more clear in the next update. I can say the choice of how you and your wife deal with the blackmail will be up to the player in the next chapter.
Hope this helps. I don't want to give away too much, but also want to answer any concerns people may have. Feel free to ask and I will answer as I can.