I just watched Cocksucker Blues, a documentary from 1972 about a Rolling Stones tour of America, directed by Robert Frank. The film has never been officially released. When it was finished the Rolling Stones decided they didn't want it shown, so it's remained in the vaults for the past 39 years, viewable only in bootleg copies. I watched it in ten parts on YouTube.
I did enjoy it as a period piece from the 70s, but it wasn't the wildly exciting documentary I anticipated. It does have its moments, including quite a prolonged scene of a woman injecting heroin. There's a lot of traveling, a lot of hotel rooms, some music, brief glimpses of sex and nudity, but the main impression you get is of a lot of stoned people sitting around talking. There isn't much of the young Rolling Stones on stage, though the few live performances are good. I suppose the director was just trying to give an impression of what life on tour was like, in which he succeeds.
I wasn't a Rolling Stones fan while young, but in later life I started to like them a lot more. The tour in the documentary is to promote the album Exile on Main Street, and that's a really fine album, one of their greatest moments.
Cocksucker Blues is an odd choice of title. I suppose it was just chosen to be offensive. Cocksucker is not a common insult in Britain. I've never used it, and I don't think I've ever heard anyone use it for real. (I've probably heard people say it in imitation of an American film or TV show.) The Rolling Stones certainly wouldn't have used the word when they were growing up. In common with the rest of London, they would have insulted someone by calling them a facking cahnt.