at first i thought "this is stupid" -- how could you marry someone and not have sex with them? but actually, who cares? marriage can be whatever you want it to be, i guess.
It might work, but then you might meet a guy that you fall for so hard that you want to have nothing to do with your bff wife anymore. But hey, why the hell not. It would be fun while it lasts.
so i agree (for everyone else.....)