Muscles from Outer Space (1962)

AMG auteur Richard Fontaine started making short, silent posing-pouch snapshot films in the mid-1950s and moved on to sound titles like In the Days of Greek Gods (1958) and Muscles from Outer Space (1962), which featured narratives as well as nudity. Fontaine's films are among the first gay-campaigning documents in American cinema--he often managed to include references to the lowly status of the homosexual. His first feature-length erotic film, In Love Again (1969), is more like propaganda than porn. (from: http://www.glbtq.com/arts/film,3.html)

Unfortunately the movie Muscles from Outer Space is not yet available on HBO Max.