Board Thread:Off-Topic Discussion/@comment-72.89.162.24-20130827050231/@comment-32500188-20140117135322

That means you didn't read it right... (・_・)

In short, "sex, drugs, and rock & roll"  is stating that it's a cliche rocker's life, it's really not singling out any one of the things like you think it is, but just more or less a parody on the old stereotype.