I'm putting this to the test:
porn -> sexuality -> penis -> vertebrate -> subphylum -> taxonomic rank -> biological classification -> biologist -> scientist -> system -> latin -> italic language -> Indo-European -> language family -> language -> human -> taxonomy -> Ancient Greek -> Greek language -> Greeks -> nation -> sovereign state -> state (polity) -> social sciences -> list of academic disciplines -> academia -> community -> interaction -> causality -> result -> sequence -> mathematics -> quantity -> property (philosophy) -> modern philosophy.
Heh, what do you know, it worked.