As scientific as this title sounds, the episode is anything but precise.  Think of it as a treasure hunt.  There are gems, but we gotta dig.  Recorded 2 days after the wedding of Sarah's oldest daughter, new thoughts on monogamy arise.  How do you respond to your mistakes? as an artist? as a partner? When is the final decision made about success or failure? When is an art piece or a relationship really done?  Sarah and Phil decide it's not so bad, being one another's experiment.