Ethan Hawke says he has an intense friendship with his wife, Ryan Hawke

He said: "My wife [keeps me grounded]. It's the most intense friendship I've ever known, and it's been fantastic for me. Everything in my life works when that's working."

Ethan once admitted he didn't know what the future held for him and Ryan.

He said: "People have such a childish view of monogamy and fidelity. 'He's cheated so he's bad, she's cheated so she's bad,' as opposed to a recognition that our species is not monogamous. To act all indignant, that your world has been rocked because your lover wasn't faithful to you, is a little bit like acting rocked that your hair went grey. Human beings are sexual beings."

Meanwhile, the 'Boyhood' star, who has daughters Clementine, six, and Indiana, three, with Ryan, and daughter Maya, 16, and son, Levon, 12, with ex-wife Uma Thurman, also says he always wanted to be a father.

He told Beach magazine: "Being a father is one of the most natural things--it's the rest of life that's so hard. Co-parenting, finding the right school--all of that c**p is a giant headache. But being a father is incredibly simple. I always wanted to be a father."