Tearoom Trade: Impersonal Sex in Public Places is a 1970 book by Laud Humphreys. Humphreys' book is based on his 1968 Ph.D. dissertation, which was entitled "Tearoom Trade: A Study of Homosexual Encounters in Public Places." The study is an analysis of male-male sexual behavior in public toilets. Humphreys asserted that the men participating in such activity came from diverse social backgrounds, had differing personal motives for seeking same-sex sexual partners in such venues, and variously self-perceived as "straight," "bisexual," or "gay."