The Velvet Vampire (1971)

Plot

A married couple finds themselves drawn to the enigmatic Diane LeFanu, who invites them to her remote desert home. As they settle into her lavish surroundings, unease begins to brew. Unbeknownst to them, Diane harbors a dark secret—she's a centuries-old vampire. The couple soon discovers that they are both captivated by her alluring charms, leading to a dangerous game of desire and manipulation. As the tension escalates, their relationship is tested against the backdrop of Diane's seductive powers and hidden intentions.