Pandagon has a article about polygamy and the sister-wives bitchin about not getting sex very often, cause they only get to be a ON wife once a month, rest of the time you are OFF.
We all live in the same house. We have a bunk-bed double on the bottom and single on the top. Husband, first wife and the "ON" wife sleep on the bottom and the other two "OFF" wives sleep above. We find this very intimate as we all are sleeping in the same bed though on different levels and we can still feel and hear what is happening when sex happens in our bed.
I'm never looking at a bunk bed the same way again....
Lucky I'm moving to a more enlighten state where this sort of thing never happens....