I was catching up in the Divorce thread, and it occurs to me that many of the divorces chronicled here on the beeb are triggered by infidelity. Seems to me that the problem is the belief that absolute fidelity is a necessary part of marriage The reality is that it is very frequently a truth that people have relationships outside of marriage that become sexual. I know a number of couples - mostly LGBT, but a few straight - who have negotiated either open relationships or are in poly relationships. While these relationships require a lot more communication, openness and honesty, it seems to me like they have a lot less drama overall, and while there are always issues to resolve in any relationship, removing the assumption of total sexual fidelity from the equation seems to take a lot of stress out of things. Probably isn't for everyone, and I do know many couples who are fully comfortable with total sexual fidelity in their relationships. But from my observation point, total fidelity is not working for many who expect it to.