Several of these horror films also incorporate the sub-theme of voyeurism, whereby the motel owner spies on (or even films) the sexual exploits of the guests. This plays on the long-established connotations of motels and illicit sexual activity, which has itself formed the basis for numerous other films, variously representing the thriller, comedy, teen film, and sexploitation genres. Stephen C. Apostolof's "Motel Confidential" (1967) and the porn film "Motel for Lovers" (1970) were two notable early examples. More recent manifestations include "Paradise Motel" (1985), "Talking Walls" (1987), "Desire and Hell at Sunset Motel" (1991), and the Korean films "Motel Cactus" (1997) and "The Motel" (2005).