Belinda Giblin is naked in the show "The Box" season 1 episode 21 which was released in 1974. She shows us her bare boobs while in bed talking with a bloke, after she fucked him off-screen. They are briefly interrupted by someone briefly opening then closing the bedroom door, which Belinda briefly sits up in bed and we see her wonderful boobs, before she relaxes and talks to the bloke once again.
Television (both Australian and UK) was so much more relaxed about nudity back then.