Thanks for your comment, Niall! I think we do conduct our relationships differently than our parents and ancestors did, but there are still common elements. We see now couples that choose open relationships and there are also couples that have differnt sexual partners, know about it, but choose to pretend their faithful. Relationships that last a lifetime are not neccessarily happy relationships - I would be curious to know how many in fact, are co-dependency situation when even if the things don't work out between partners they don't find the courage to part ways.