Lights! Camera! Viagra!

On a typical day, when filming can stretch on for 14 hours, Bune will strip down and have sex in front of a camera crew as many as three times. During busy times, he might work five days a week.

It's a grueling schedule, and Bune has popped so many blue diamond-shaped Viagra pills that one film director said some crew members have teased him about his "blue tongue."

"I don't think men should be ashamed that they do use it," said Bune, who often relies on Viagra for film shoots. "I'm not ashamed of it. People know that I use it. It doesn't make me any less of a man or a person."

Call it better porn through chemistry. Viagra, the drug that has transformed the sex lives of the elderly and the impotent, has swept through an industry that arguably needs it the least.

From aging male actors seeking to further their careers to anxious directors pushing to cut production costs by eliminating awkward performance delays, the wonder drug of sex has become a critical tool for today's adult entertainment industry.

Bune (pronounced boo-NAY), who has become a regular on porn sets throughout the San Fernando Valley, said he has taken as much as 100 milligrams a day--about twice the normal dose--and knows of peers who have used even more. With the current hectic pace of film production, some actors are taking the pill for every shoot, turning the industry into an unwitting mass experiment for Viagra usage.

Some actresses and directors are getting fed up with it all, rolling their eyes whenever they see the telltale signs of a Viagra-amped actor: the flushed face and chest, the glazed look.

"They're using drugs designed for men with particular problems, and these guys don't have that particular problem," said veteran actress Nina Hartley.

Yet the pill has helped create dozens of male stars and eliminated so many annoying production snafus that industry players say they are willing to put up with the occasional lapses and potential health problems.

"I put Viagra right up there with the polio vaccine, as far as making my job easier," said director Michael McCormick of Metro Productions.