The Brazilian siren was near the start of her legendary career, in her mid twenties, when she performed in this low-budget erotic cheesefest.
Carlos and Solange, childhood sweethearts, marry after a chaste courtship. On their wedding night, Solange refuses to make love to him. First he pleads, then in anger he rapes her. She says she adores him, but, even after months of marriage, can’t endure his touch. To prove to herself she’s not frigid, she begins a daily routine of seducing strangers on public buses; she also takes Carlos’s best friend to a motel. Carlos figures out that she’s unfaithful and, armed, confronts Solange. Meanwhile, she seeks psychiatric help because she feels no remorse. Will there be violence and death, a psychological breakthrough, or more bus rides?

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The movie does sound cheesy, but she is super attractive. Thanks.
I think in the 70s nudity was more desired than story line.
If you check out recent low budget movies that are shown on streaming channels, you will once again find that copious amounts of naked women trump story line. Low budget film makers have always used it to sell movies because it always works. Hollywood used to often film scenes of naked women in movies and the worse the movie was, the more nude scenes they would leave in. It was a sort of insurance.