According to FemaleFirst, the Oscar-winner for her role in Michael Clayton and her man, filmmaker John Byrne, are very open to a polygamous relationship.
Byrne admitted to seeing the other woman, Jeanine Davis, for two years without any objection from Tilda Swinton. He explained about his love life, "It’s all very relaxed and amicable. We have not hidden away and Jeanine is very much part of my life. Tilda knows all about it and is more than happy with the situation." Byrne is the father of Swinton’s children, Xavier and Honor.
Swinton isn’t exactly innocent either, since the 47-year-old actress has had a romance with the German painter, Sandro Kopp, 29.