It all comes down to trust and communication between the couple. I can speak from my own experience, I'm very much close to one of my best girl friends, met her fiance who later became her husband. they are so open to each other, to an extant that on their wedding day, I danced the whole night with the bride and everyone kept asking who is that guy the bride keeps dancing with and not her husband...the husband replied: Her life long, best friend....its all about trust and integrity between the couples.