Professor Marston and the Wonder Women
The story is told in flashbacks set during a 1945 testimony that William Moulton Marston gives to representatives of the Child Study Association of America. In the year 1928, William and his wife Elizabeth teach and work on their research at the associated Harvard and Radcliffe Colleges. One day, William hires one of his students, Olive Byrne (daughter of Ethel Byrne and niece of Margaret Sanger - two famous suffragists and feminists of the 20th century) as a research assistant. Olive aids in the Marstons' work in inventing the lie detector and conducting research on William's DISC theory on human interactions, and the three soon grow close. One after another tests by the lie detector reveal that they have fallen in love with one another, and all three of them begin to engage in a poly-amorous relationship
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https://www.imdb.com/title/tt6133130/?ref_%3Dnv_sr_1