Remember Zippy, George and Bungle playing with each other's twangers?

Below is a transcript from an episode of Rainbow, there's a video clip HERE. I can't believe they got away with it. It certainly puts the alleged Captain Pugwash innuendo in the shade.
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The sketch opens with Zippy peeling a banana...

Zippy: "One skin, two skin, three skin, four.... "

George: "Zippy, where is Bungle?"

Zippy: "I think Geoffrey is trying to get him up"

We see a view of the door and hear Bungle moaning from behind it.

Bungle: "Geoffrey, I can't get it in"

Geoffrey: "You managed it last night"

Bungle: "I know, let's try it round the other way around. Ooooooh, I've got it in"

Bungle and Geoffrey enter the studio with Bungle carrying a hammer and peg kit

Bungle: "Would you stick this on the shelf, George"

George: "I can't reach, you'll have to stick it up yourself,

Geoffrey (to camera) " Hello everyone, today we are talking about playing"

Bungle: "Playing with each other, Geoffrey?"

Geoffrey: "Yes Bungle, do you have a special friend that you like to play with?"

George: "Yesterday we played with our balls.

Are we going to play with our friend's balls today?"

Bungle: "Yes, and we can play with our twangers as well."

Geoffrey (to camera): Have you seen Bungles twanger?

Zippy: "Oh I have, I showed him how to pluck with it."

Bungle: "It's my plucking instrument."

Geoffrey asks the audience if they can pluck like Bungle

Zippy: "I can, I'm the best plucker here."

George: "And I'm good at banging. My peg's hard isn't it Zippy?"

Zippy: "Well of course it is, Your peg wouldn't go in if it was soft."

Geoffrey: "Let's get back to Bungle's twanger."

Bungle (excited): "Oooooh Geoffrey, we could all paint our twangers couldn't we?"

George: "Let's sing that plucking song."

Bungle: "Rod and Roger can get their instruments out and Jane has got two lovely Maracas."

Singers Rod, Roger and Jane enter.

Rod: "We could hear you all banging away."

Roger: "Banging can be fun."

Jane: "Ooooh yes, and I was banging away all last night with Rod and Roger."

Roger (looking sad): "Yes, but it broke my plucking instrument."

Geoffrey: "Never mind Roger, let sing the plucking song, come on everybody get your instruments out."

Rod (to Jane): "Do you want to blow on my pipe while I'm twanging away?"

Jane: "Oh no Rod, I was blowing a lot with Roger last night. But would you like to play with my maracas?"

Zippy: "No, let's just pluck away with our twangers."

Bungle: "Yes, it doesn't matter what size your twanger is."

Zippy: "I've got a big red one."

George: "I've only got a tiny twanger. But it works well and I like to play with it."

Geoffrey (to viewers): "Well, have you got your twangers out? And remember, you can bounce your balls at the same time. If you haven't got any balls,

ask a friend if you can play with his. Now, let's all sing the plucking song."

Everyone in studio: "Pluck, pluck, pluck away, we're going to pluck all day today."

"Pluck, pluck, pluck away, we're going to pluck all day."

Geoffrey (to viewers): " It's time for us all to go now, but don't forget to get your twangers out and play with your balls." "See you soon. Bye."