There is an abundance of evidence that children do best in stable families with two biological parents, and that the casualisation of families is one of the leading factors entrenching disadvantage for kids. Bettina Arndt has been a sex therapist, author, and clinical psychologist, and after decades of talking to the Australian public about sex has become an advocate for that most old-fashioned of institutions: marriage. Talking about the importance of marriage in ensuring good outcomes for children across our society, however, has proven very unpopular. Life and Faith asks Bettina about the evidence, and why people don’t want to hear it.