United States of America
The USA (United States of America) is the country with the world's biggest porn industry. Many big companies like Vivid or LFP (Hustler) have their headquarters in the US.
Since the 70s, San Fernando Valley in Los Angeles/Kalifornien is the heart of the erotic industry. This is where 90 percent of the American porn movies are produced. San Fernando Valley is sometimes called "Porn Valley", "San Pornando Valley" or "Silicone Valley" (like "Silicon Valley", as a reference to the silicone breast implants as opposed to the tech capitol, where silicon is meant).