> When analyzing the whole sample, approximately 2% of heterosexual participants, 32% of gay participants, 5% of lesbian participants, 22% of bisexual participants, and 14% of those who described their sexualities as “other” reported being in open relationships;
-- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5958351/
Similar ratio from studies done in 2005 and 2015 in the UK: https://www.theguardian.com/lifeandstyle/2016/jul/22/gay-dat...
As another gay man, I used to be radically skeptical of monogamy. Like in my 20s I was spouting the line that it's a heterosexual construct falsely imposed on us for moralistic reasons. But both personal experience, and a widened social group, has led me to believe that, for a significant number of gay men a monogamous relationship is ideal. They're happiest in them, and seem to be able to make them work. Perhaps with some compromises and perhaps not entirely happy, but for what it's worth, I'm not sure I've met any couple that was perfectly happy.