David Hilliard writes that relationships such as Newman's with Froude and St John "were not regarded by contemporaries as unnatural. ... Nor is it possible, on the basis of passionate words uttered by mid-Victorians, to make a clear distinction between male affection and homosexual feeling. Theirs was a generation prepared to accept romantic friendships between men simply as friendships without sexual significance. Only with the emergence in the late nineteenth century of the doctrine of the stiff upper lip and the concept of homosexuality as an identifiable condition, did open expressions of love between men become suspect and regarded in a new light as morally undesirable". Men born in the first decades of the nineteenth century had a capacity, which did not survive into later generations, for intense male friendships. The friendship of Alfred Tennyson and Arthur Hallam, immortalised in "In Memoriam A.H.H.", is a famous example. Less well-known is that of Charles Kingsley and his closest friend at Cambridge, Charles Mansfield.