Similarly, in the Netherlands, where homosexuality is widely accepted, a 2003 study found the average duration of “steady” male partnerships to range from 0.75 to 2.25 years. These “steady” relationships were found to have an annual average of eight casual partners in addition to the significant other.

Similarly, in the Netherlands, where homosexuality is widely accepted, a 2003 study found the average duration of “steady” male partnerships to range from 0.75 to 2.25 years. These “steady” relationships were found to have an annual average of eight casual partners in addition to the significant other.

And here:

Q. But doesn’t expanding marriage to include homosexuals actually help strengthen marriage?

A</b. Just the opposite. There is recent evidence from the Netherlands, arguably the most “gay-friendly” culture on earth, that homosexual men have a very difficult time honoring the ideal of marriage. Even though same-sex “marriage” is legal there, a British medical journal reports male homosexual relationships last, on average, 1.5 years, and gay men have an average of eight partners a year outside of their supposedly “committed” relationships.
Contrast that

They’re using a study which specifically EXCLUDED monogamous couple, to show that committed gay couples are incapable of being monogamous.