The road to acceptance hasn't been easy for the Australian gay community but despite strong opposition to their cause, gay Australians have fought for and won the same rights as everyone else, except for one… the right to get married. Gregory and Michael are gay activists, atheists and engaged to be married. David is a husband, a father of three and a conservative Anglican minister who believes sexually-active gay people do not have the right to marry. Gregory and Michael stay with David for the first five days of the experiment, and they’re in for a series of surprises starting with being banished to sleep in a caravan rather than under the same roof as David’s children and ending with the discovery that David has a genetically identical twin brother who used to be gay. Then the experiment swaps and David attends Greg and Michael’s wedding in New Zealand before marching in Melbourne’s Gay Pride parade.