Experts Week sees Mel, Paul and Charlene set exercises specifically designed to strengthen and develop each couple's marriage. However, an ill-judged honeymoon comment comes back to haunt one groom, while the challenge of facing uncomfortable truths proves too much for a marriage that's already on the rocks.

Mel, Charlene and Paul invite the couples to the couch for the second Commitment Ceremony of the experiment. Some reflect on a positive week, but others struggle to overcome feelings of betrayal. Another marriage is rocked by a lack of attraction, forcing them to face the tough decision of whether to stay and work at their marriage, or leave the process - and each other - for good.