Homosexual men’s sex habits studies have repeatedly concluded that “marriage” between two men does not necessarily mean monogamy nor fidelity.
Having sex outside of a gay marriage is not a deal-breaker, is not a huge threat to a “marriage.” What it means is (for example) a gay single man may have 60 sex partners in a year (including anonymous sex partners); he gets married, so he cuts down on anonymous sex and only has 20 sex partners per year.
I’ve read a number of articles about gay men “marriage,” and some of the statistics and self-reporting is truly sickening.
Monogamous relationships have sexual boundaries. Sexually deviant ones don’t.