The sexual revolutionaries of the 1960s, including advocates for 'adult' material such as Hugh Hefner and Al Goldstein, represented porn to us as a great social radicalizer. But a nation of masturbating people who are looking at screens rather than at one another - who are consuming sex like any other product and who are rewiring their brains to find less and less abandon and joy in one another's arms, and to bond more and more with pixels - is a subjugated, not a liberated, population.