The Unbearable Lightness of Being is a 1988 American film adaptation of the novel of the same name by Milan Kundera, published in 1984. Director Philip Kaufman and screenwriter JeanClaude Carrire portray the effect on Czechoslovak artistic and intellectual life during the 1968 Prague Spring of socialist liberalization preceding invasion by Soviet led Warsaw Pact and subsequent coup that ushered in hardline communism. It portrays the moral, political, and psychosexual consequences for three bohemian friends a surgeon, and two female artists with whom he has a sexual relationship.
Tomas asks Sabina to help Tereza find work as a photographer. Tereza is fascinated and jealous as she grasps that Sabina and Tomas are lovers, but has a somewhat lesbian affection for Sabina. Nevertheless, Tomas marries Tereza, in a simple ceremony with both perputually laughing, followed by her double standard distress about Tomas polyamory. Although she considers leaving Tomas, she becomes more attached to Tomas when Soviet Army tanks invade Czechoslovakia. Amidst the confusion, Tereza photographs demonstrations against the Soviet forces and victims, then hands the rolls of film to foreigners to smuggle to the West. Facing the stultifying reality that replaced the Prague Spring, Tomas, Sabina and Tereza flee Czechoslovakia for Switzerland first Sabina, then the hesitant Tomas and Tereza.In Geneva, Sabina meets Franz Derek de Lint, a married university professor they begin a love affair. After some time, he decides to abandon his wife and family for her. After hearing the declaration, Sabina abandons Franz, feeling he would emotionally weigh her down. Meanwhile, Tereza and Tomas attempt to adapt to Switzerland, whose people Tereza finds inhospitable. When she discovers that Tomas continues womanizing, she leaves him and returns to Czechoslovakia. Upset by her leaving, Tomas follows Tereza to Czechoslovakia, where his passport is confiscated, trapping him incountry nevertheless, his return elates Tereza. They are reunited. ........
Source: Wikipedia