Sometimes… Like a Prostitute (1978)
A popular author of erotic novels is cuckolded by his two friends: one screws his wife while the other screws his mistress.
Actors: Erina Miyai
Invisible Man: Grape! (1978)
A horny scientist who is married to a hot wife and lives with his virginal step sister invents a drug that can make him invisible. Erotic high jinks ensue.
Zoom In: Sex Apartments (1980)
While biking on her way to her ex-boyfriend’s place, a wife gets graped in an open field. She proceeds to go to her ex-bf’s place, anyway, doesn’t tell him about the grape, and has sex with him.
Sex Hunter (1980)
A disabled guy’s sister who is in love with him trains his virginal girlfriend to become a sex-mad slut, hoping that when he sees what a whore she has become, he will reject her and fall straight into his sister’s loving arms instead.
Hell’s Revenge (1979)
A wife conspires with her lover to k..l her old husband for inheritance money. Her lover pretends as a home invader and grapes/screws her in front of her husband to give him a heart attack.
Play it, Boogie-Woogie (1981)
When a chick’s live-in boyfriend suggests that she should prostitute herself so that she can earn more money than her bartending salary, she gets offended and cheats on him with an older man.