What is "Tearoom Trade" primarily about?

The concept of "Tearoom Trade" primarily refers to the analysis of homosexual acts that occur in public toilets, specifically focusing on the behaviors and interactions among men seeking sexual encounters in these settings. This topic was notably studied by sociologist Laud Humphreys in his 1970 research, where he observed and documented the activities within public restrooms, referred to as "tearooms," to understand the social dynamics and anonymity associated with such encounters.

Humphreys' work highlighted not only the sexual behavior itself but also the societal implications and the stigma surrounding homosexuality at the time. His research generated discussions around privacy, consent, and ethical considerations in sociological studies. Thus, the focus on the analysis of these acts, the environments in which they occur, and the participants’ interactions is what makes this option the correct choice.

The other options diverge from this specific focus; public demonstrations of sexual acts or a history of restroom use do not directly address the targeted study of homosexual behavior within public restrooms, nor does the dissertation on societal impacts of homosexuality encapsulate the methodological approach taken by Humphreys.