Contemporary relationships are in a state of rapid evolution. These changes can and should empower people with the opportunity to develop partnerships based on their own sexualities, understandings, and agreements. This makes it possible to create what Kenneth Haslam, founder of the Kinsey Institute's Polyamory Archive, has called designer relationships. The possibilities are limitless, and thinking about a partnership as something people can craft allows for flexibility and change. Relationships can open and close or have varying degrees and kinds of openness as circumstances demand. In the context of a designer relationship, decisions are made mutually, consciously, and deliberately. Best-selling authors and relationship experts Patricia Johnson and Mark A. Michaels are exemplars of this life choice, and have studied polyamory for over 20 years.