A marriage culture, which is essential to a healthy society, is nourished when we are faithful to and honor its time-tested definition, which is simply not elastic.
… Research from a major British medical journal on male same-sex relationships in the Netherlands—arguably one of the most gay-friendly cultures in the world (and where same-sex marriage is legal)—indicates gay men have a very difficult time living by the values of marriage. This study found that, on average, steady homosexual relationships in the city of Amsterdam lasted only 1.5 years. The study also found that gay men in steady relationships there have an average of eight partners a year outside of their current relationships. And remember the attitude of the first couple in line on May 17, 2004, to get a same-sex marriage license in Provincetown, Massachusetts. They admitted to having an open marriage.
Contrast that with the fact that 67 percent o first marriages in the United States last ten years, and more than three-quarters of heterosexual married couples report being faithful to their wedding vows.
Some same-sex marriage apologists explain that if homosexuals had the social pull of marriage to keep them monogamous like heterosexuals do, then they would be more monogamous like heterosexuals. But data like that from Amsterdam exposes this as wishful thinking. . . .
No, opening marriage to people who simply want the legal benefits it provides and little else does not strengthen marriage.
Glenn T. Stanton and Dr. Bill Maier, “Marriage on Trial: The Case Against Same-Sex Marriage and Parenting,” pg.43-44