Most countries have long ago allowed shooting and distributing porn movies on their territory. This has happened partially due to the sexual revolution that changed the attitudes of the public to sex, and partially due to the fact that porn industry contributes considerably to every country’s budget – that is, if it is legal. However, there are places where porn movies are shot more often than in other locations, both geographically, and in terms of the entourage.
According to Wikipedia, in 2006, statistically, every 39 minutes there was a porn movie shot and distributed in the US. This is quite a high number; obviously, it does not mean that a new movie was shot virtually every day. However, today, this number is probably even higher, considering the technologies available.