6. Tilda Swinton + John Byrne: The unmarried duo has twins, but she has said that they both enjoy the company of others while remaining close. "It may seem odd but it is certainly the best thing for the children," the actress said. "It's not something I try to promote as a radical lifestyle choice. But it's a situation I find very healthy. I can maintain my life with my children and their father and spend time with the man I've become very fond of. I am very fortunate there has been a lot of understanding by the men." Progressive, indeed.