Perverse Play (1986)

Kazuo, an aspiring writer, has brought his works to magazines many times, but they have all been rejected. His wife Yoshiko works as a hostess to help with the family finances, but to get material for his works, she experiences SM and has lesbian sex with her friend Yoko. One day, he brings Kyoko, whom he picked up in the city, to be his SM model, and the work Kazuo writes based on this experience is recognized by the magazine for the first time, but Kyoko has a surprising true nature...