All of this is just hedging or having your cake and eating it too. People who date outside their marriage probably don't have a marriage that is worth much. I could be wrong but I have seen so many of these so-called free relationships fall apart that I wonder if there was ever any commitment.
and I know of many many "free relationships....open mariages......swinging couples.....who's relationship and marriages are a hell of alot stronger than many "monogamous" or "vanilla" relationships/marriages.