Statistical skullduggery from the Fatherhood Foundation: "proving" gay relationships shorter

On page 10 of the anti-gay pamphlet "21 reasons why gender matters" there is a piece of statistical deception that is very popular among anti-gay circles. It is one that needs no examination of references to spot.

The text is as follows:

Heterosexual married couples have a far lower rate of relationship breakdown than homosexual couples. As an Australian Government report stated, “According to a 1995 study, ten per cent of marriages failed within six years, 20 per cent within ten years, 30 per cent by twenty years, and 40 per cent by thirty years.”65 In comparison, a study of the Melbourne homosexual community showed that 40 per cent of men had changed partners in the past 6 months; 9.8 per cent had been in a relationship for only six months to a year; 18.8 per cent for 1-2 years; 15.3 per cent had lasted for 3-5 years; and only 15.7 per cent were in a relationship of more than five years – meaning 84 per cent had broken down after five years.

The lie is glaringly obvious to anyone within even a slight understanding of statistics: the Fatherhood Foundation is comparing every single homosexual relationship to only those heterosexual relationships that are called "marriage". They've deliberately and dishonestly weighted the heterosexual side of the comparison by excluding all unmarried opposite-sex couples, and then used that false data to try and paint homosexual couples as inherently inferior across the board. Unmarried opposite-sex couples, and not married opposite-sex couples, would be the real equivalent of unmarried same-sex male couples such as those allegedly studied in Melbourne. But making a comparison that's actually valid wouldn't give the Fatherhood Foundation the opportunity to smear the gay community with their misinformation now, would it?