Married people having affairs--no. If you want to continue having affairs, then don't get married. They are called "vows" for a reason.
I agree, Babe. If you're a sexual hedonist and you have some type of need that can't be filled by just one partner, hey, that's your business. But keep it out of the marriage, unless you're in some kind of mutually agreed upon "open marriage."
I mean, if that's your lifestyle, again, it's your business. But if that's the case, why bother getting married in the first place?