1. Do you think swinging is acceptable?
--If the spouses agree to it, yes. If not, then absolutely not.
2. Even if both parties consent, would you consider it adultery?
--Not if both consent.
3. If both parties consent, but only one spouse sleeps around is that "fair"?
--Yes, with no other facts presented...
4. Should a couple still indulge in "swinging" if they have children?
--No idea, though I know people who do.
5. Which avenues are the most appropriate, i.e., swinger parties, internet encounters, hooking up with mutual friends, etc.?
--How should I know? I have no experience in this area.
Sex is an integral part of a marriage and if you aren't satisfied with one person then you shouldn't have gotten married.
--This is your opinion. Others out there believe that polyamorous marriage is a possibility. Personally, I don't know that I could handle polyamory, but I've met some people who say they can. If that's so, then I have no problem with them marrying as many people as they can.
The OT, by the way, had no problem with polygamy either.
Interesting that you do and make statements like this: "the epitome of monogamy - the institution of marriage." when you know that polygamous marriage was the norm in many cultures and at many different times.