Which Beatle wrote and sang the song "Why Don't We Do It in the Road" after being inspired by seeing two monkeys copulating in the street?

The Beatle who wrote and sang the song "Why Don't We Do It in the Road" after being inspired by seeing two monkeys copulating in the street is Paul McCartney. He witnessed this incident while on a visit to Rishikesh, India, during the band's stay at an ashram in 1968. Intrigued by the primal and instinctual nature of the monkeys' behavior, McCartney wrote the song, which became a controversial yet memorable track on The Beatles' self-titled album, commonly known as the "White Album."