I guess it was inspired on Bret Easton Ellis' "Less than Zero" a Brett's favourite so includes all above refered: Brett's new kind of life, drugs, raves, anal sex, living on the edge... as that ridiculous world goes by
Brett's said both that it's himself from Justine's perspective (in Love and Poison) and 'gay animal sex' (in Introducing the Band). I can't help wondering how those two reconcile.