? for the Men

[Harrier]

First, I think this analogy doesn't really apply to marriages. A business partnership can be had because each party is trying to get something out of the venture - usually profits and some sense of self-fulfillment.
With a marriage it's a whole level of give and take and the emotional needs are significant. If my business partner is cheating on the company. the solution is simple. Dissolve the partnership.
If my W (or H) is cheating on the marriage. The solution isn't so simple. I can't just "dissolve" the marriage and go about my happy way. There are strong feelings and feelings that have no place in business - like love and attachment.
You can love what you do, but to be successful in business, you have to make cold calculation decisions. You just can't do that in a marriage.

That being said, I do think it is important to put boundaries in place in light of a cheating spouse. But you need to put them up when you are ready and you can be strong enough to make sure that you can follow through. Because one thing that could be worse that no boundaries are boundaries without consequence. But ultimately, it is not your choice to follow the boundaries. It is your spouse. You can put up all the rules in place regarding the OM or OW, but if your spouse doesn't respect you and the marriage they will chose the OM or OW. The boundaries (or rules) just give them a framework in which to operate. (or try to sneak around)
The boundaries do reflect on you though. They show that 1) you know about the A, 2) You respect the M and yourself enough not to let it continue as is, 3) You are strong enough to stand up to the A and 4) you understand the seriousness of it. I'm sure they are others.
I think the spouse does get mad at first by the boundaries. The inclination is to rebel against them (very few will accede to them at first)- just like they rebel against the pleading, crying etc. But the Boundaries are a position of strength for you and you should see them as such.
those are my thoughts.