From The Art and Popular Culture Encyclopedia
A pornographic actor/actress or a porn star is somebody who appears in pornographic films or photographs, live sex shows or peep shows. Many actors and actresses may appear nude in films (usually filmed in explicit sexual genres). Most genres have specialists who achieve most of their recognition in a specific niche market such as bondage or strap-on sex.
Some legal jurisdictions consider commercial pornography as a form of prostitution, though most commercial sex film performers do not regard themselves as prostitutes for various reasons. Most notably these performers are usually not paid directly by their sexual partners for the sex but through an agency and directly choose their partners themselves. Some sex film performers do not receive money at all for their inclusion in such films. In this instance, they do so for promotion of their other works such as artistry paintings and sculptures, or have no sex in the films such as repeat performers in the famous Girls Gone Wild film series.