This dissertation makes the case to reclaim the typically negative term, coterie, as a poetic method and offers the epithalamium as a valuable object for the study of coterie conditions and values. This examination of the historical poetics of the epithalamium shows how the form was reappropriated by gay postwar poets and those in related social circumstances. This study applies and builds on theories developed by Arthur Marotti (John Donne: Coterie Poet), and Lytle Shaw (Frank O'Hara: The Poetics of Coterie) and subsequent critics to develop a coterie poetics, the markers and terms for which I have arranged here to demonstrate conscious "sociable" poetics. It is thus to our advantage to study coterie conditions and methods to open readers to insights into twentieth-century poets that have deliberately exploited reception among those in private and public spheres, just as their Early-Modern precursors did--often as a matter of survival, but also as formative practice. The key figures in this study wrote significant epithalamia or made major theoretical claims for coterie poetics: John Donne (1572-1631), W. H. Auden (1907-1973), Paul Goodman (1910-1972), and Frank O'Hara (1926-1966). O'Hara's poetry is approached as the apex of coterie poetics; his personal immediacy and obscure personal references should alienate and exclude--yet, they invite.