Until recently the sex life of older people was more or less invisible in family and gerontological research. This chapter contributes to breaking this silence by focusing on the role and meaning of sex in intimate relationships in later life. Based on biographical case studies, the chapter investigates how sexual norms have changed over the life course of contemporary cohorts of older people and how they have experienced this change. The chapter considers sexual intimacy as part of new intimate relationships established late in life and questions the persistent assumption that older people who date are primarily looking for companionate relationships. It is shown that older people’s ideas about sex are deeply embedded in an ideology of love, where sex tends to be viewed as a natural part of a loving relationship, while sex outside of a loving relationship – also in a loveless marriage – is frowned on.