Family Law Act 1975 passed by the Federal Parliament brings in no fault divorce.
Before 1975 the Matrimonial Causes Act 1959 provided 14 grounds for the grant of divorce, including adultery, desertion, cruelty, habitual drunkenness, imprisonment and insanity. To succeed on one of these grounds, a spouse had to prove marital fault.
As gaining proof was often expensive, divorce was often only accessible to the wealthy.
Today, the sole ground for divorce is that the marriage has broken down irretrievably.