Are you saying you have both a wife AND girlfriend???? Or are you hypothetically saying that WHEN you have a wife or a girlfriend they're going to love being your stay-at-home, pumping out children, sandwich maker? I'm seriously confused.
Oh and "Happy wife = Happy" life is not what you're describing. What you're describing is "Happy Life = Happy Wife." There's a difference. The latter displays an incredible lack of awareness. It assumes that a woman who does not have a career and stays home taking care of all the household chores and children makes for a happy life and will thus make her happy. "Happy wife = Happy life" actually means that whatever a wife desires will make her spouse's life happy when he/she helps her realize her wants and needs. Since you're not a wife, you can't define the terms of what makes one happy.