A Woman in Flames

Eva, an upper-class housewife, frustratedly leaves her arrogant husband and decides to enter the call girl business. She lets Yvonne, a prostitute, teach her the basics and both set out for prey together, until Eva starts an affair with Chris, who turns out to be a call boy, as well. Consequently, she moves into his penthouse, large enough for both to offer their services separately.
This is one hell of a smart, erotic, intriguing, well-told movie. It's one of the best of its genre, one of the most memorable movies of the Eighties, and one of the classiest to have come out of Germany. It remains shocking and edgy until today, and was like a cultural bomb in its time when, years before the internet, homosexuality and sadomasochism were still very much on the cultural dark side of the moon.