Sex Report From a Female Private Detective: Housewife Prostitution (1973) watch uncut
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Kyōko is a woman with a promiscuous past who is sexually unsatisfied with her marriage. Her frustrations lead her to have hedonistic dreams, such as her mother and grandfather having sex together. Seeking to rejuvenate her marriage, she throws a wild party. The ploy is a success.
An upwardly-mobile banker’s boss introduces him to the adopted daughter of a wealthy client. He falls in love with the girl and wants to marry her, not knowing that she is involved in a kinky sadomasochistic relationship with her artist father.