Well, I thought you liked a controversial answer, since you like sensationalism.
P.S. there is a cookbook written by a Japanese murderer who ate some tourists, that's what cannibalist recipes are.
As far as the Ian Dury and the Blockheads cliche goes:
What matters to most of us here is that Zeppelin were talented musicians, whether they had a lot of drugs and sex or not (when I listen to one of their records I won't be going off like.....wooow, did you hear how good that heroin was after they recorded that song after having sex with some groupie).
No one here can exactly tell you how good their sexual qualities are, neither has anyone here ever shared coke with Zeppelin as far as I know, haha.....
Since I don't know your age I won't tell you to get some drugs yourself and experience what it is like, instead of discussing other peoples drug consumption.
And if you really want to know what goes on inside the mind of a psycho killer I would recommend you to talk to one personally (don't get eaten, btw, he might have read the cannibalist cookbook as well, lol)