Okay, that's good. I don't think in-house separation works, b/c nobody knows the ground rules. The LBH is trying to work on the M and the WW wants to play around. I realize many couples go this route, however, I have not seen it successful on the board. I believe it might be successful, if the H would act as if he's single instead of the doting H to a woman who doesn't want him.
The frustration is horrible with in-house separation. The LBH is constantly in the face of disrespect. He doesn't know where to draw the line between cake eating and family.
To me, when the couple agrees to in-house S, the WS gets all the advantages of M life and the single life.
Just be sure you know what's in store.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!
