And speaking of PKD--yes, I'm a Dickhead--I've read many of his books* and seen most of the movies based on his books. See this list for the movies made from his work.
And you evolutionaries might be interested to know that Dick's unfinished last novel, The Owl in Daylight, has this theme:
"The plot was to express what he believed was an evolutionary step in humanity, using an interpretation of Joachim de Fiore, where he believed that one age of humanity used the left side of the brain, another the right, and the future would combine the two leading to a greater understanding of what is real."
Though I'm pretty sure it's not at all like kennilingus evolution.
* My fav being his last book, The Transmigration of Timothy Archer, which I re-read every few years and still enjoy with each reading.