Only on the "CBS This Morning" podcast, relationship expert Belinda Luscombe joins co-host Gayle King to share the factors that make a marriage work. In her book "Marriageology: The Art and Science of Staying Together," Luscombe shares what her research has revealed about what can help strengthen a relationship. She explains why people should stop looking for a soul mate, why we lash out at the people we love and why she says we?re doing marriage backwards. Plus, Luscombe shares the six 'F categories' that couples should focus on: familiarity, fighting, finances, fooling around, family and finding help.