Beatles songs, Girl

PAUL circa-1994: 'It was John's original idea, but it was very much co-written.
I remember writing 'the pain and pleasure,' and 'a man must break his back.' …It was amusing to see if we could get a naughty word on the record.
The Beach Boys had a song out where they'd done 'la la la la' and we loved the innocence of that and wanted to copy it but not use the same phrase.
So we were looking around for another phrase – 'dit dit dit dit,' which we decided to change it in our waggishness to 'tit tit tit tit.' And it gave us a laugh.
It was good to get some light relief in the middle of this real big career that we were forging.
If we could put in something that was a little bit subversive then we would.
George Martin would say, 'Was that dit-dit or tit-tit you were singing?' 'Oh! dit-dit George, but it does sound a bit like that, doesn't it?' Then we'd get in the car and break down laughing.'