Amis Kingsley. The Alteration

The Alteration is a 1976 alternate history novel by Kingsley Amis, set in a parallel universe in which the Reformation did not take place. It won the John W. Campbell Memorial Award in 1977.
In his biography of Kingsley Amis, Richard Bradford devotes a chapter to The Alteration, its origins and context within the author's life. In 1973, Amis had heard a reproduction of the voice of Alessandro Moreschi, the last known European castrato. Amis disagreed with the proposition that Moreschi's performance could be considered "great art," because Moreschi had been castrated, and "true" art centred on the celebration of human sexuality.Bradford argues that this was a matter of considerable importance for Amis himself, as he may have been suffering from impotence or sexual dysfunction in his marriage, due to advancing age. Thus, he took exception to Roman Catholic teaching, based as it was in a magisterium of celibate men who had never undertaken sexual pleasure within their lives.