Society values monogamy & sexual fidelity in marriage, even if many- gay and straight- fail to live up to that ideal.<quoted text>
Monogamy, as in one wife, or husband at a time, not sexual fidelity, which doesn't appear to be that popular among gay men.
So why would it bother you, now that some states have rejected conjugality as the sole basis of legal marriage, if another state rejected monogamy, as well?
There is no evidence gay men are any less faithful to their partners than straight men are to their partners. You're merely perpetuating a stereotype, which is typical of the anti-gays.
No state has rejected conjugality as the sole basis of legal marriage; they all still limit marriage to 2 people.
I don't support polygamy because it's primarily a religious cult institution with a history of harming women & children. I don't think the risk is worth it.