I don't know why the two (cheating/worthless) would be equal. Cheating, on its own, has no effect on the distribution of "responsibilities" (I guess) in the relationship. The wife banging the UPS guy is still doing the other wife-stuff. The guy banging his secretary, the same. The worthless one is, by definition, not doing anything.
But I get your point.
When two people enter in to an agreement, say, "Honey, I will go to college and get a great job, we will be together forever!" And then one helps to support that goal, and then the goal is attained, they don't deserve any fruits of that labor?
I don't think so. I'd have to pull out my marriage certificate, once I figured out where it was, to actually look.
This was from Google:
Can't really read it, but from what I remember, there are certainly no clauses, or requirements of fidelity. Certain churches certainly require it, like Catholocism, but you can make up any vows you want.
Here is a link to an
application, again no clauses for, really, anything.