According to Sheikh KhalilChami of the Islamic Welfare Centre in Sydney’s Lakemba suburb, polygamous marriages, although illegal, exist in Australia.

http://newsblaze.com/story/20080902140449iwfs.nb/topstory.html

Recent evidence  indicates that governments tend to look the other way as the conjugal mores of seventh-century Arabia — and the problems that travel with them — take root in our backyards.

http://www.meforum.org/article/1865