The Curse of Ursula
Italy 1978. Director: Enzo Milioni
Cast: Barbara Magnolfi, Stefania D'Amario, Marc Porel
Aka: La Sorella di Ursula

Quite literally yellowish giallo (or perhaps it's just this print) about two sisters, Ursula and Dagmar, on vacation. Strange killings occur at the seaside hotel where the sisters are staying. Someone is stabbing immoral nude women to death with a gigantic dildo. A nude guy have his throat cut open. Not much more happens. People are driving around in their cars, has sex a lot or are killed until the mystic killer is revealed at the end. Lots of gratuitous muff-shots and some fantastic music on the soundtrack. Barbara Magnolfi was in Suspiria and Stefania D'Amario was in Zombi 2. Deserves a look for the curious trash-collector.