Documentary series exploring unusual lives. This edition examines some of the most extraordinary relationships in Britain: threesomes. In South Wales, John shares his wife Shanea with Noel, who also has a child with her. Meanwhile, in London, twentysomething Aussie librarian Davina lives with her husband Dean and her bisexual lover Jen. The programme explores how these threesomes manage their lives, and follows Dean as he makes a call to his mother explaining his new marital situation.