Just some context for the readers to appreciate the song...
The song was written and recorded in late 1967 for Gainsbourg's girlfriend, Brigitte Bardot. She asked him to write the most beautiful love song he could imagine and
that night he wrote "Je t'aime" and "Bonnie and Clyde".
However, news of the recording reached the press and Bardot's husband, German businessman Gunter Sachs, was angry and called for the single to be withdrawn.
Bardot pleaded with Gainsbourg not to release it. He complied but observed "The music is very pure. For the first time in my life, I write a love song and it's taken badly".
In 1968, Gainsbourg and English actress Jane Birkin began a relationship when they met on the set of the film Slogan. After filming, he asked her to record the song with him. Birkin had heard the Bardot version and thought it "so hot".
She said: "I only sang it because I didn't want anybody else to sing it", jealous at the thought of his sharing a recording studio with someone else.
The duet, recorded in 1969, reached number one in the UK, the first foreign-language song to do so, and number two in Ireland, but was banned in several countries due to its overtly sexual content...
That was over 50 years ago, but still hot AF