Similar inequalities here in Australia - but also applied to de-facto couples, including (following recent legislative changes) same-sex couples.

I know people sharing living in share houses who have had to provide *very* detailed info to determine if they are in a "marriage-like" relationship (food shared? shared meals? bills shared? who does the cooking/shopping/housework? shared bank accounts? sleeping arrangements? etc). Don't know what triggers the questioning tho - know someone who is in a "marriage like relationship", has been for many years, no questions asked.