Like most guys of my generation—I'm on the downslide to 40—I have fond memories of my first experience with pornography. I was 14 years old and my best friend had just discovered his father's secret stash. We gathered in his basement and delicately turned the pages as if they might disintegrate. I asked him if I could borrow a few mags "just for the night," which in hindsight was a pretty bold request. I was, after all, essentially announcing my intention to masturbate. Slipping past my parents with the stack of old Hustlers stuffed inside my jacket, I somehow made it to my bedroom and, not believing my good fortune, stayed up all night relishing the spoils.

To the modern 14-year-old, the scenario would be laughably quaint: There's no stash to be hidden these days. You can "clear history," along with any residual shame, in one click. At each adolescent fingertip is an inexhaustable stream of high-def images and Flash video—some 400 million pornographic Web pages in all. The sheer breadth is staggering: If you watched porn 24 hours a day, for example, it would take you several years just to get caught up on the 13,588 professional titles released in the United States in 2005 alone. Plenty more is out there in bulk on the digital shelf, no credit card required: bestiality, piss-drinking, throat-fucking, bukkake gang bangs, triple anal penetrations—all exhaustively cross-referenced. Any day now, some poor kid may actually go blind masturbating.

The awkward truth, according to one study, is that 90 percent of 8-to-16-year-olds have viewed pornography online. Considering the standard climax to even the most vanilla hard-core scene today, that means there is an entire generation of young people who think sex ends with a money shot to the face. It's hard to pinpoint exactly where the age divide falls, but it's safe to say that the first purebred guinea pig to have grown up never knowing a world without fisting on demand is probably around 22 years old.

By the time they're in high school, America's porn-fed youth have already amassed an encyclopedic knowledge of smut. Seth Rogen, cowriter of Superbad—which features a now-classic scene of teenage boys graphically discussing hard-core sites—recently told me that one of his favorite pastimes is trolling porn message boards. "It's hilarious how much these kids know," Rogen says. "There'll be arguments like 'This is classified as gonzo, but I would say it's more of a feature-BDSM. Also, they say this clip is taken from Handjobs #8, but this scene was actually first featured in Killer Grips #7.'"

Rogen might as well have been talking about brothers Travis and Cody, typical 21-year-old college students in Florida who tell me there's one criterion at the top of their list when it comes to picking a fuck buddy. "Pubic hair is disgusting," Travis says. "Girls should keep their vaginas porn-star trim." Cody describes his first real-life ejaculate-to-the-face finale like this: "It was the happiest moment of my young life. There is just something about blowing a load in a chick's face that makes you feel like a man."