It doesn't work for me and, in about 90% of the cases I've seen, it doesn't work for many. Often the term 'open relationship' is used to mean "I can cheat on you." by one or the other. Often that same person will be the one applying arbitrary rules to the other person (a man saying that his girlfriend can only be with other girls, not other guys) that the first person doesn't have to(or intend to) follow. They usually involve a lot of deceit, if not outright lying, and someone usually ends up hurt in the end (often, it is a third person who was being led on).
As I see it: if you can't be satisfied by the person you're in love with, then fucking someone else probably isn't going to solve your relationship ills.
I have seen it work, short term, for some people though. It needs to be on completely equal footing, and the third parties need to be chosen for their compatibility with the entire situation, not just how well they'll fit against someone's naughty bits. As soon as one part of a couple is lying to or manipulating the other in any way, the entire thing is going to either become extremely unhealthy or fall apart entirely. The 'significant other' needs to come well before the secondary and tertiary others, otherwise why would you even consider it anything more than dating?
As I see it: if you can't be satisfied by the person you're in love with, then fucking someone else probably isn't going to solve your relationship ills.
I have seen it work, short term, for some people though. It needs to be on completely equal footing, and the third parties need to be chosen for their compatibility with the entire situation, not just how well they'll fit against someone's naughty bits. As soon as one part of a couple is lying to or manipulating the other in any way, the entire thing is going to either become extremely unhealthy or fall apart entirely. The 'significant other' needs to come well before the secondary and tertiary others, otherwise why would you even consider it anything more than dating?