Quoting Devil Duckie:" nope. Either you get married or you don't and you're ok to sleep around. I don't care what kind a smoke screen you throw on it. NOT a marriage. "
Actually, still a marriage. Again, not a marriage YOU like, but the definition of marriage is actually pretty simple. Did they get married? Yup. Then they're marriage. You can have a couple who are 100% sexless. Are people who stop sleeping together suddenly no longer married? How often to they need to have sex with each otehr to be considered married? What about oral sex with others, can they still be married if that happens?
See, their sex life doesn't define their marital status. Having sex with only one person doesn't make you married, and having sex with multiple doesn't make you NOT married.