Why does pornography exist?

Answer 1

People like sex. And no matter what it is about people will write about it, make drawings, paintings and movies, even statues of it. As a result of the way normal, healthy people are built, they become sexually excited when they see a sexual act.

(Except where moral or religious teachings indicate that there is something inherently wrong with seeing sexual acts.)

Sexual Excitement and Voyeurism

Sex, as an experience common to all humans, is physically and emotionally pleasurable. However, all individuals do not experience as much sexual activity as they would like, or of the types they would want. So pornography allows them to vicariously, or voyeuristically, experience sexual images and activities. This is often accompanied by masturbation, as is computer-connected sex or phone sex.

The attraction of pornography has led to its manufacture and dissemination, and the internet has become the predominant media for its viewing and sale. Ironically, the internet has also led to wider promotion of sexual materials than was previously available, which adversely impacted many commercial suppliers. An ever-larger market has created an ever-larger supply and will provide less profit for any individual enterprise. Traditional magazines (and phone sex sellers) have experienced a dramatic reduction in their business as a result of the internet.

Despite attempts at regulation and some restrictive laws, most pornography has found protection under the First Amendment freedoms of speech and of the press. The few exceptions that are still vigorously prosecuted are pornography using minors (kiddie porn) and snuff (real death/murder porn).
Porn exist for many reason. People make porn just for the money and people watch it just for fun.

Answer 2

This part of question quit effective for those who were married couple. They open use this idea, by Surfing free porn videos online and watch it to enhance their excitement in sexual aspect of their life.