The Australian Christian Lobby fears legalising gay marriage could lead to polygamists also venturing down the aisle.

In its submission to a Senate inquiry on marriage equality lobby spokesman Jim Wallace says married, biological parents provide the ideal environment in which to raise children.

He fears allowing same-sex marriage would open up the flood gates.

Altering the definition of marriage to include same-sex relationships, on the basis of equality and non-discrimination, would create “a vulnerability” in the institution of marriage to further charges of discrimination by other minority sexualities, the lobby said in its submission.

Polygamy describes relationships involving more than two people.

http://news.ninemsn.com.au/national/8447350/christian-lobby-fears-polygamist-weddings