Thank you Gingrich for creating a controversy right up my alley.  The debate about cheating vs open marriage is now a mainstream topic, at least for the time being.  The link below: http://www.nytimes.com/roomfordebate/2012/01/20/the-gingrich-question-cheating-vs-open-marriage

Here are my 3 favourite pros: by Chistopher Ryan and Cacilda Jetha – Sex at Dawn,  Dan Savage and the author of the Ethical Slut.
http://www.nytimes.com/roomfordebate/2012/01/20/the-gingrich-question-cheating-vs-open-marriage/voters-prefer-newt-gingrichs-adultery-to-open-marriage

On the Con side I tried to choose two persuasive writers and I think they sum up the fears and outside opinion quite well.