The Friday File: In 2015, the latest year for which reliable estimated data is available, pornography was a $3.3 billion/year industry in the USA and $10 billion/year globally. Revenue growth has been below 1%/year for the last five years and revenues today are probably half what they were a decade ago given rampant piracy, the proliferation of free sites, homemade content and bans of adult content by app stores.