Just recently got fluid bonded with new amorata by circumstance--we had technical failure with a condom and ended up swapping fluids. The twist to that is that now I use condoms with my wife, until we get the next round of testing and make certain everything is OK.
That's a weird feeling for me--now able to go bare with the gf and not with the wife. Ah, the joys of responsible behavior!
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.