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Movies like DAU. Nikita Tanya (2020)

Within the top secret Institute of Physics Problems, the scientist Nikita Nekrasov is visited by his wife and small children. While away from his family the physicist has managed to fall in love with other women. In open conversations with his spouse – in the bedroom, the dining room, and while out walking – he attempts to convince her of the legitimacy of polygamous relationships, and to test the limits of her unconditional love.