[sin7]

I was a little off. I could not remember the actual heuristic.

marital happiness = rate of lovemaking - rate of arguments

Source: http://books.google.com/books?id=_0H8gwj4a1MC&pg=PA393&#...

[tertius]

I would define arguments differently than I would conflict (or resolved conflict) I guess.

So that might have some truth but I believe it blurs the truth by making the reader or observer (of research) believe that arguing/conflict is bad.