She hints at the fact that the info was gleaned from diaries and other writings from the working class. Well...it isn't explicitly stated that she used these so I guess some assumptions need to be made. I would say, for an article like this with a lay audience in mind, maybe it's not so important that everything is cited as it would be in a research paper or an article in a history journal.
"Not only are there the usual problems in uncovering evidence about the lives of the poor and often unlettered men and women who made up the bulk of the population, but sex is also a topic about which all levels of society were generally reticent. Yet, if evidence about the sexual behaviour of ordinary people is hard to find, it certainly exists.
Working-class diaries and autobiographies shed a unique and important light on the lives of the poor. While many autobiographical writers steered well clear of revealing anything about their intimate experiences, others found they were unable to write their life history without touching upon matters of a sexual nature. As a result such sources can help us to understand not only the social customs that controlled sexual activity in the pre-industrial era, but also the weakening of these controls during the turbulent years of the Industrial Revolution."
"Not only are there the usual problems in uncovering evidence about the lives of the poor and often unlettered men and women who made up the bulk of the population, but sex is also a topic about which all levels of society were generally reticent. Yet, if evidence about the sexual behaviour of ordinary people is hard to find, it certainly exists.
Working-class diaries and autobiographies shed a unique and important light on the lives of the poor. While many autobiographical writers steered well clear of revealing anything about their intimate experiences, others found they were unable to write their life history without touching upon matters of a sexual nature. As a result such sources can help us to understand not only the social customs that controlled sexual activity in the pre-industrial era, but also the weakening of these controls during the turbulent years of the Industrial Revolution."