S.T.H. (an acronym for Straight to Hell), also known as The Manhattan Review of Unnatural Acts, is an American gay pornography and erotic non-fiction zine founded by Boyd McDonald. It publishes autobiographical stories of male-male sexual encounters, as submitted by the magazine's readership. First published in the early 1970s, S.T.H. became an influential publication in New York City's arts and culture spheres, and counted notable literary figures such as William S. Burroughs, Allen Ginsberg, and Gore Vidal among its readership.