In pornographic films directed at a heterosexual male viewer, the primary focus is on the women in them, who are mostly selected on their on-screen appearance or physical appeal and for their willingness and ability to perform the required sex acts. Most male performers in heterosexual pornography are generally selected less for their looks than for their sexual prowess, namely their ability to do three things: achieve an erection while on a busy film set, maintain that erection while performing on camera, and then ejaculate on cue.[1] The pornography industry in the United States was the first to develop its own movie star system, especially for commercial reasons. In other countries, the "star" system is not common, with most actors being amateurs. Most performers use a pseudonym and strive to maintain off-screen anonymit