John Lennon began bringing Yoko Ono into the studio with The Beatles. Paul McCartney said some of their behavior was off-putting.
The songwriting relationship between Paul McCartney and John Lennon was one of the most prolific of all time. They began to write on a more individual basis as the 1960s wore on, and their working relationship fell apart entirely when The Beatles broke up. McCartney noticed a shift in their dynamic when Lennon met Yoko Ono. He believed Lennon was intentionally putting distance between them to leave more time for her.
When Lennon and Ono began a relationship, they started spending all their time together. He brought her to Beatles recording sessions, which bothered his bandmates.“Now John had to have Yoko there,” McCartney said in The Beatles Anthology. “I can’t blame him, they were intensely in love — in the first throes of the first passions — but it was fairly off-putting having her sitting on one of the amps. You wanted to say, ‘Excuse me, love — can I turn the volume up?’ We were always wondering how to say, ‘Could you get off my amp?’ without interfering with their relationship.”
Source: Emma McKee/cheatsheet.com