Re:  It's not adultery

Mr. Molitor:

Counterpoint:  Yes, it is.  Is Spouse A married to Spouse B?  Yes.  Is Spouse A engaging in the marital act with New Person C?  Yes.  Then it is adultery, engaging in the marital act with someone not one's spouse.

From the example mentioned in the article, one cannot tell certain factors which would make the subject more or less sympathetic, but the basic reality does not change.  The woman in the good Cdl.'s example is presumably Catholic, and presumably got married outside the Church.  She knew when she started that she was acting contrary to the reality of the first marriage; for whatever reason, that did not stop her.  What if Actual Wife repents and asks to come back?

The basic nature of marriage - a free, faithful, total commitment to the other spouse, leading to children in the ordinary course - - is so well and easily understood, particularly when the couple takes vows that, you know, actually say that is what  (oops, to be con't.)