In this period, arthouse sensations such as Last Tango in Paris (1972) and In the Realm of the Senses (1976) also used loosening censorship laws to explore eroticism on screen with a new frankness.
In 1973 he compiled eight of the best into a programme called The Erotic Films of Peter de Rome (available on BFI DVD), and they were shown to great acclaim in festivals around the world.
In the 1970s, gay porn was a rare genre which showed homosexual men, more commonly depicted as villains or victims, as having a good time.
Warren went on to direct some highly successful low-budget horror films in the 1970s but his feature debut reflected an interest in art cinema rather than exploitation.
Incredibly tame by modern standards, the film has many pleasures – a swinging jazz score, some tightly edited montage sequences and an unsettling atmosphere.