I guess in a way it is but usually swingers do their thing in front of their partners, so it's no real secret. Kind of 50/50 to me.
Adultery: Voluntary sexual intercourse between a married person and a person who is not his or her spouse.
---Sounds like it is.
I believe it's adultery.
So in the "Legal Sense" it IS Adultery. Now that being said, IF a Couple has an "Open Relationship" and are both entertaining a "Swinging life style" then certain agreements and understanding exist between the two CONSENTING adults.
So is it STILL adultery . . YES, BUT if it something the two have an agreement about and have based their life on . . Well then what then? . . . .
I know of a couple that live this way, and seem to be happy. I am too old school to even consider such a thing . .
I think it is. Personally, I believe that when you're married to someone, you not only make a romantic commitment, but also a physical/sexual commitment. I believe a person should only share their body with their spouse.
But hey, to each their own... Just don't complain if your partner isn't faithful to you.
Yes it is adultery, now is it wrong? Well, that would depend on what you chose to believe.