By the following thought experiment. Imagine a kind of latter-day Conrad character who has worked for a time as a mercenary in Africa, for a time as a doctor in Nepal, for a time as the manager of a nightclub in Miami. The specifics don’t matter– just someone who has seen a lot. Now imagine comparing what’s inside this guy’s head with what’s inside the head of a well-behaved sixteen year old girl from the suburbs. What does he think that would shock her? He knows the world; she knows, or at least embodies, present taboos. Subtract one from the other, and the result is what we can’t say.

What you can’t say, Paul Graham
Hackers & Painters, Chapter 3 (other excerpts on twitter)