Brown's departure reveals accidental lesbian sex ban

The 67-year-old's final speech to the National Press Club in Canberra on Tuesday was littered with anecdotes about his political career, which ends next week.

The story that got the most laughs related to his time campaigning for gay rights as a Tasmanian MP in the mid-1980s.

Senator Brown said he expected the then opposition Labor party to move to get rid of section 122 of the criminal code, which proscribed male homosexuality – but it didn't.

"So, very nervously, I moved that it also be made gender neutral and