By the way, you kind find a thread about words and definitions at: http://www.polyamory.com/forum/showt...5365#post15365
Basically, if it's "just sex" outside your primary relationship, it's swing or FWB. If there are emotions and possibly commitment involved (i.e. "in love") with other lovers, then it's polyamory.
Are you guys open to a polyamorous dynamic possibly developing, or are you keeping it at the "just open" stage for now? (Just curious.)