I really like that article you posted, ehBeth.
"Ethical slut"
Been there, done that, got bored.
I truly think this is an individual thing. Very personal. If it works: go for it. If it doesn't: I guess it's your life anyways. I have serious doubts as to the "open relationship" as defined in ehBeth's article. Definetly not for moi.
I have screwed around a lot in 'untraditional relationships' and yet in my heart of hearts there is a special place for marriage (the closed relationship in my mind). My thinking is: just don't get married if you want others in the mix! I don't judge others who choose differently. Perhaps the marriage means something else to them.
I guess I wonder: Why marry if you aren't in it for the iron long haul of complete commitment? The benefits such as economics, social, etc.?!
To each his own. However, I envy relationships like Bella and Chaitea describe. It requires digging deep deep. You just can't get that in any other situation. It's special.
Hope everything works out for you.