Henry & June (1990)

"A true adventure more erotic than any fantasy"

While traveling in Paris, author Henry Miller and his wife, June, meet Anais Nin, and sexual sparks fly as Nin starts an affair with the openly bisexual June. When June is forced to return to the U.S., she gives Nin her blessing to sleep with her husband. Then, when June returns to France, an unexpected, and sometimes contentious, threesome forms.