I don't know what has been written on this thread but I wanted to reply to your original thoughts before going back and reading. Excuse me if there are repeats.
I think that the idea of people avoiding crossing the bridge is valid, but it think its for different reasons than one might think. Having talked a lot about monogamy and polyamory with both types of people I have come to realize that mostly people who are monogamous think the idea of poly as a theory but in practice they just don't have the time, interest or inclination to pursue it. They prefer other "hobbies" over their relationship dynamics.
It seems for some self work is not that important and other things in life are. So why bother going down roads that have known bridges if you can take the over pass quite happily. I don't think its much to do with jealousy until one partner wants to try out a poly lifestyle for whatever reason.
By doing a tag search for "mono/poly" you will find additions to this discussion. It could shed more light on what mono people think.
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Last edited by redpepper; 11-07-2011 at 08:39 PM.