“Throughout it all, Yoko sat on the sofa, in stunned, mortified silence, as other guests began awkwardly getting up to leave — until they realized that their coats were in the bedroom where John was having sex,” Mintz, 79, writes.

Mintz, who was a close friend of the famous couple, claims the incident took place at a New York City party to watch the 1972 presidential election results between Richard Nixon and George McGovern.

Lennon allegedly hooked up with the unnamed woman after getting drunk and feeling upset that Nixon would come out victorious.“He was placing [his wife] in the most embarrassing position that you could ever place a woman in — having a romp in the hay in another room with thin walls while your wife was attending a small party and could hear everything,” Mintz told People Tuesday while promoting the book.

“The reality is, as I would learn over the years in the bad behavior department, John would say to me, ‘Ellie,’ which is what he called me, ‘I’m not always the ‘Imagine’ guy,’” Mintz recalled to People.

Ono and Lennon tied the knot in March 1969 and were together until he was murdered in December 1980 at age 40.

Their relationship was far from perfect — Lennon even had an affair with their assistant, May Pang, for about 18 months.However, Pang alleged in her 2023 documentary, “The Lost Weekend: A Love Story,” that Ono gave them her blessing to get together.“Yoko walked into my office and said, ‘John and I are not getting along. I want you to go out with him,’” she claimed.While she was reluctant at first, Pang and Lennon would soon couple up and spend the next year and a half loved up in New York and then California.

“[Yoko] did not realize it was going to turn into such a big love affair,” Pang said. “She thought it would be two weeks, gone, goodbye.”Ono and Lennon’s relationship has also infamously been blamed for breaking up The Beatles’ — though both parties denied having such influence on the band.“We All Shine On: John, Yoko, and Me” is available now.