The West Australian:

Perth Catholic Archbishop Barry Hickey has warned that the archdiocese will stop conducting legal marriages if it was forced to carry out same-sex unions.

... Catholic newspaper The Record reported Archbishop Hickey as saying that if the push for same-sex marriage succeeded, the Catholic Church would continue to celebrate marriage as it always had.

"We might be back to the ghetto. We can't do those marriages at all. And if the law forces us to, we cancel our registration as marriage celebrants. We just don't do it," he told parishioners of the Traditional Anglican Church parish of St Ninian and St Chad in Maylands on Sunday.

Archbishop Hickey said he had "very, very serious concerns" about the Federal Government's push to amend marriage laws to include same-sex unions.