Another interesting scenario is whether or not to invite "partners". It's hard enough when traditional rules wavered on inviting non-married couples. (It's ok if they've dated for a year or are living together, but not ok if they just started fucking).
But, it gets really weird when we have to include our friends from the S/m and Poly world. ("Ok... Person "X" is no longer Person "Y"'s slave, but "X" is still the boyfriend of person "Z"; meanwhile "Z" is collared to "W", who's now having sex with "Y", but "Y" hates "V" and "V" is part of triad relationship of "TUV".)
Sounds like a Logic Problem from Hell.
I cant wait until we get to the seating charts... *sigh*