Dear Julia & Tony,
If you cannot follow the fine example of New Zealand and other countries for compassionate reasons or human rights reasons or for even for <gasp> sheer human decency, then why not try thinking about same-sex marriage as an economic issue.
New Zealand is about to benefit from a gay tourist boom that Australia will miss out on - until you two galoots join the twenty-first century. Have a little think about it and get Treasury to do a cost-benefit analysis. You'll soon see what I mean.
Of course, I would prefer you to do it for the right reasons - but if economic management turns you on....
Love & kisses,
Roger