Christianity placed sex at the centre of Christian morality by giving it a special status as the original sin. Christianity created institutional mechanisms for incessant analysis of one's sexuality. ‘The invention of sexuality’ looks at how political, social, religious, and cultural change over the last few hundred years have shaped the notion of ‘sexuality’ today. The term itself first appeared in 1879. Three models of sexuality have emerged: the moral/religious model (sex is the original sin); the biological model (sex is the outcome of natural desires); and the social model (society is responsible for sexual neurosis). They came about successively but they are all present in the modern world.