This thriller by renowned Italian screenwriter Ernesto Gastaldi is a very early Giallo - made just shortly after Mario Bava's first modern Italian thriller SEI DONNE PER L'ASSASSINO (1964) that is considered being the first real Giallo at all. But LIBIDO, shot in black and white, is not only one of the earliest Gialli. It is also one of the most accomplished - even though it was made in less than three weeks according to Gastaldi.