Won't hurt you or your marriage, don't worry about it.<quoted text>
When you get married its to your life partner whether that's gay or straight. If there were ever more than 2 allowed in a marriage it would cause power struggle problems when one passes. With 2 there is no issue as far as that goes
If legal, polygamy will still be so rare you'll probably never have to be offended by the sight of a happy poly family.