The `Arthur` actor - who is married to pop princess Katy Perry - admitted while he is keen to start a family with the `E.T.` hitmaker in the future, he is worried about losing his "social ethics" when he becomes a father. He said: "I would like to start a family, although sometimes I worry that if you have children, you are compromised in that you might lose your social ethics, because you`ve become genetically predisposed to protect that child. "So sometimes I think that if you don`t have children it makes you more powerful in terms of the fact that no-one can kill your children." Meanwhile, Russell - who previously battled alcohol and drug addictions - explained while he was once excited by "wealth and lavish experiences", he is now happy to have "domesticity" with Katy. He added to The Independent newspaper: "I think that once you`re not poor - and I`m not poor anymore - your ambitions don`t centre so much around wealth and lavish experience. They become more about domesticity and privacy. "I`m no longer spellbound by excess or excited by, `I`d like to hire out the Grand Canyon with lap dancers`. I don`t do things like that anymore. Besides, it seems like a waste of a canyon."