high court says no gay marriage, page-73

Actually, there is any number of examples of homosexuality in nature. Visit any cattle farm [we do regularly] and you'll see cows humping cows, bulls humping bulls, even steers having a go with each other. How many people have had their leg humped by the wayward ['de-sexed']domestic dog.
In the wild, frustrated male lions denied the opportunity of sex with head of the pride's lionesses, or perhaps not wanting to have sex with them anyway, regularly have sex with each other. Similar behaviour patterns have been observed among chimpanzees, balibos, kangaroos etc.
In supporting your case you'd better revert to the traditional, "Oh, they're primitive animals. Humans shouldn't engage in those acts because we're civilised and God's chosen creatures" type argument your predecessors used.