J. Michael Phayer 
Sexual Liberation and Religion in Nineteenth Century Europe [PDF ebook] 

This study, originally published in 1977, demonstrates that a change in mentality in the nineteenth-century drifted from traditional sexual controls and allowed them greater sexual freedom and indulgence. The process occurred in such a way that the proletariat never considered whether their newly found sexual liberation might be in conflict with the moral teachings of the Church. This title will be of interest to students of history and religion.