It appears that "Dr. Winston O'Boogie" was no slow-hand prude. These passages from Philip Norman's bio on John's life are almost guaranteed to raise a smile:
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[John] became a dedicated wanker, undeterred by any fear of heavenly retribution and, as always, in company with his arch-crony, Pete Shotton. It was a further symbol of their closeness, without any suggestion of the homoerotic; they wanked together as an act of Shennon-Lotton rebellion and defiance and mutual showing off. John proved to have a particular aptitude and near-inexhaustible stamina. Once, he accepted Pete's challenge to do it ten times in a single day, the prize being unlimited access to the Shotton family's television set. He failed to reach this target, but only by one go. (Norman, John Lennon: The Life, pp. 72-73)
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I suppose it hardly needs to be pointed out, then, that John's magic number was "Number 9" for more than one reason!
In later years, when John, Paul, George, Stu and Pete did their rounds in Hamburg at the Indra, Norman reports that John had lost none of his hormone-raging enthusiasm:
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Paul remembered that "I'd walk in on John and see a little bottom going up and down and a girl underneath. It was perfectly normal, you'd go 'Oh shit, sorry ...' and back out of the room." Pete Best, himself no mean sexual athlete, was amazed at John's capacity, and that he still had enough libido left over to be a connoisseur of the Reeperbahn's spectacular "wank mags." (ibid., p. 201)
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No wonder John had no time for "fussing and fighting." He was too busy "lying with his eyes while his hands were busy working overtime."