Regarding what the song is actually about, here is what its writer, Mick Jagger, said:
In the Rolling Stone interview (14 December 1995, RS 723) Jagger spoke at length about the song, its inspiration and success, and taking credit for writing the lyrics. Keith Richards also credits Jagger with the song in his autobiography.[14] Jagger attributed the success of the song to a "good groove". After noting that the lyrics could mean so many lewd subjects,[15] he again noted that the combination of those subjects, the lyrical ambiguity was partially why the song was considered successful. He noted, "That makes it... the whole mess thrown in. God knows what I'm on about on that song. It's such a mishmash. All the nasty subjects in one go... I never would write that song now." When interviewer Jann Wenner asked him why, Jagger replied, "I would probably censor myself. I'd think, 'Oh God, I can't. I've got to stop. I can't just write raw like that.'"[16]