mpter the new laws are in place you won't have to even be married to lose half your stuff.
you just need to be in a defacto relationship (and its a very loose description too) for 2 years or more and its enough to have pay maintenance for the rest of their life even if they are in a new defacto relationship. (the law doesn't apply if they get married though)
have a 2 or more ex defactos and your screwed, they get half you super too.
it even applies to a mistress if you are able to mpford one in the first place.