If you check out an article he wrote about Jack Nitzsche on Gadfly Online website, he also talks about Mick Jagger and Mick Taylor towards the end of the article. It's no secret really that Mick Jagger is a player and can be very manipulative, and he said that he turned Mick Taylor into a Humpty Dumpty within two years. I always thought that Jagger played with MT's mind, promising him songwriting credit is one example.
Now, having re-read the article, in that paragraph they were referring to bisexuality. Now I hope it isn't underscoring a rumor about Jagger and Taylor, or it's just emphasizing the fact that Jagger played with peoples' minds. Who knows, drugs turned peoples' brains to mush..it was 1974...a crazy time!!