Suck Buddy (1970)

Sinopsis

Fictional vampires have long stalked the world of movies, books and comics, but a new international subculture has emerged that takes things to an arguably unhealthy level. What would compel willing victims to donate their own blood to be consumed by self-proclaimed vampires? Real-life blood-drinkers are interviewed, as well as make-up artists, vampire hunters, psychologists and experts of all stripes.