If you don't know any straight people who have divorced after only a few months of marriage, come to the States and I'll introduce you to my sister. She did it twice -- first marriage lasted seven weeks and the second marriage lasted five months.
I had a college friend who I think may have set a record. She was on her honeymoon at the beach and ran into one of her bridesmaids.
She thought it was a coincidence.
Turned out her husband of 2 days had been seeing her bridesmaid before they got married.
They were drunk in the hotel bar that night and her husband confessed and left her there and went and spent the rest of the week with her bridesmaid.
She went home, got her things and went home to her parents. The divorce went through a year later.