Human love is what makes us or breaks us. It is through good relationships with others – colleagues, family, friends and lovers – that human beings thrive. Bad and abusive relationships can do untold harm to a person’s identity and sense of themselves. The Christian community has long promoted marriage and family life as a context for human flourishing. But there are relationships other than marriage where such flourishing can happen, and not all marriages are happy and healthy ones. Equality, reciprocity, mutuality and authentic consent are some of the touchstones of good relationships. But these concepts are complex. What can Christians bring to the debate about human relational ethics?