There doesnt always have to be a desire from both partners to be with other people im sure there are plenty of people out there in open relationships that work just fine with only one of them with multiple partners but i have to agree for me its the lies that gets me most. I am not personaly nor have i ever been in an open relationship but i would sure hope that if my wife wanted to be she would ask and we could talk and figure out if we were both actually comfortable with it. This is just my opinion however and you should do what you feel is right if it seems like its something you could both enjoy and agree on then give it a shot what do you really have to lose?