Exciting Eros: Hot Skin (1986)

Exciting Eros: Hot Skin 1986 / エキサイティング・エロ 熱い肌 1986 / Yôsei Mamiko: mashô no yobigoe , Yosei Mamiko: masho no yobigoe , 陽星真見子 魔性の呼び声 , Gimme Shelter

The mother does half-nude aerobics until her son rapes her, and the daughter falls into bed with a female teacher. Despite the shocking goings-on, the film is much more in keeping with Sato's usual themes of alienation and corrupted innocence than its brutal predecessor. Source: theMoviedb