Invisible aliens in a tiny flying saucer in search of heroin land on top of a New York City apartment inhabited by a drug dealer and her female, androgynous, nymphomaniac, fashion model, lover. The aliens soon discover that they prefer the human pheromones created in the brain during orgasm to heroin, and the model's casual sex partners begin to disappear. The bizarre scenario is observed by a lonely woman in the building across the street, a German scientist who is following the aliens, and a drug-addicted male model.