Moreover, one has to wonder what it is that's being influenced. The Joy Of Sex was something of a watershed in popular culture and a wild best-seller as well, but intellectual it was not. Mein Kampf was certainly influential. So was Mead's Coming of Age in Samoa - the preceding two despite a certain shortage of factual underpinning.
Once again, the list ignored one of the most influential books of my life, but then Naughty Nurses In Bondage never did get any credit as the think-piece it is...