In an impassioned defence of gay marriage, Melbourne lord mayor Robert Doyle says government has no place in people's bedrooms and should be happy if ''people find each other, love each other and develop strong partnerships''.

Government should say ''it is not our business to determine who you should love'', Cr Doyle told Fairfax Media.

Robert Doyle urged the state and federal governments to change laws to allow same-sex marriage. Credit:Penny Stephens

His stance contrasts sharply with that of new Premier Denis Napthine and is likely to put pressure on the Liberal Party he once led in Victoria. As lord mayor, Cr Doyle signs relationship declaration certificates for ceremonies at the Town Hall.

Cr Doyle, who has spoken of growing up in a non-traditional family, urged the state and federal governments to change laws to allow same-sex marriage.