From your link...
“But if polygamy is meant to signify freedom, is it not antithetical there be so many rules? Not if one considers the aim of such rules is so neither of the two in any relationship feel superseded or threatened in kind by the new partner; so they may feel they are still a priority in the eyes of their loved one: I may sleep with him or her, but you’re the one I come back home to and share my life with. This assurance will go a long way in making the relationship work.”
Yep, nothing says love and trust and intimacy like coming home late at night and telling your “partner” what a wonderful time you had screwing someone else.
And bringing who-knows-what-new-diseases to "share" with the main partner and possibly with "adjacent" children in the house.