Married Alive (1927)

James Duxbury (Lou Tellegen) is an exponent of polygamy, which may not be legal but certainly provides him with several evenings of entertainment. Professor Charles Orme (Matt Moore) falls in love with Duxbury's fourth wife Amy (Margaret Livingston). Things get dicey indeed as Orme tries to figure out whether Amy is still married to Duxbury or not -- in fact, Duxbury isn't sure either.