At the risk of sounding merely contrarian, I can offer a handful of counterexamples that I know personally.

Are you sure? I mean it's very easy to see when it goes wrong but seeing that it's all fine is a different thing.

There is a reason why the experimentation with that kind of relationships have been on a decline since it's peak in the sixties/seventies.

We are talking about being in love not just being fuck buddies.

So HN debate is now reduced to fallacy linking?

This is not just from one example this among other things a series of documentaries, friends and my now 37 years.

Of course there are some people who can deal with it but chances are that they are not in love. That is at least my experience feel free to counter with experiences or knowledge about successful open relationships where the people are

Hardly, but without some background or sources I'd say a majority of people wouldn't know where you're coming from.

I am not sure I follow. Do you know of anyone in an open relationship who is in love and happy about their spouse fooling around with other people?

I know of none and I know quite a few people who did it, saw a couple of documentaries about it.

I am more than happy to be proven wrong but as far as I am concerned my point still stands and is fairly rational.

If you are in love, open relationships ain't what it's all pumped up to be.

In support of your point, a logical analysis that is relevant to why open relationships really don't work if you are talking about serious intimacy and not just screwing around casually:

http://www.novemberwest.com/blog/?p=5

Disclaimer: I wrote it. Yes, it's my site. Whatever.