Gay marriage became legal in 2001 (the Netherlands was the first country to do it). It became The study from the Netherland Central Bureau for Statistics indicates that gay couples are divorcing at about one percent per year, about the same as heterosexual couples.
The authors of the study are quick to point out, however, that it’s too soon to make conclusions based on this one study. Among other things:
Lesbian couples tend to divorce at a slightly higher rate than gay male couples.
And here’s a good quote from the article for you: “Although the legalization of gay marriage caused great debate here, the issue has quickly faded, and the Dutch viewed recent controversies in the United States with bemusement.”