Velvet Vampire, The (1971)

aka’s: Cemetery Girls/The Devil Is A Woman/The Waking Hour

Sleepy-eyed nice guy Lee Ritter (Michael Boldgett) and his vapid but pretty wife Susan (Sherry Miles) accept the invitation of mysterious vixen Diane LeFanu (Celeste Yarnall) to visit her in a secluded desert estate. Tensions arise when the couple, unaware at first that Diane is in reality a centuries-old vampire, realize that they are both objects of the pale temptress’ seductions.