Most male performers in adult movies are chosen less for their looks and more for their sexual prowess, which is their ability to do three things: achieve an erection while in a busy and sometimes stressful environment, maintain that erection while performing on camera and ejaculating at a specific moment. In the past, an actor’s inability to maintain an erection or undergo premature ejaculation could make the difference between a film making a profit or a loss. If an actor loses his erection, filming is forced to stop. This problem has been addressed by using Viagra, although according to director John Stagliano, using Viagra means “You also lose a dimension.The guy’s fucking without being aroused..” Ron Jeremy, John Holmes and Rocco Siffredi are considered the greatest male performers of all time. Ron Jeremy has been in the industry since the 1970s and has become something of a cultural icon. Ken Shimizu is credited with having sex with more than 8,000 women during the making of 7,500 films.