Island of Death

Island of Death, also known as Devils in Mykonos and A Craving for Lust, is a 1976 English-language Greek exploitation horror film directed by Nico Mastorakis and starring Bob Behling, Jane Lyle, Jessica Dublin, Gerard Gonalons, Jannice McConnell, and Nikos Tsachiridis. Its plot follows two tourists—a young man and woman, both sexual sadists posing as newlyweds—who visit the Greek island of Mykonos and start a rampage of murder, killing anyone they believe to be sinful or perverted.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.