According to Joan Jett's website, it translates to “I love to make love, especially with three.”
Others say that the lyrics J'aime faire l'amour sur tout a trois literally mean "I love sex especially in a threesome."
Joan and Kenny Laguna (songwriter and record producer), had written all of “The French Song,” except the chorus.
They wanted to write a song about a ménage a trios with the chorus in French but had trouble translating correctly. Luckily, Mike Winter, Joan’s guitar tech in the early 80’s and had been in the French band Shaken Street, was able to help them and came up with the lyric that translates to, “I love to make love, especially with three.”
Mike then came up with a pronunciation of “trois” the French word for “three,” so one could not tell if Joan was singing “three” or “you,” leaving it ambiguous in case anyone was offended by the idea of a ménage a trois.
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