Borrowing the same upload model and willful disregard for copyright laws, the next generation of porn sites have made it a whole lot easier for little Johnny to watch videos with names like "teens in satin panties" and "Adriana Sage rides the monkey rocker."

At the recently concluded Adult Entertainment Expo in Las Vegas, one prominent XXX executive explained pornography's perfect marriage with the YouTube environment: "Customers do not want to watch entire movies," Hotmovies.com's Richard Cohen reportedly said. "They want to watch scenes."

Pornotube.com, with its obvious nod to YouTube, is currently the reigning free-sex site on the web. If you think this is fringe business for a small gang of perverts, think again. According to web traffic monitor Alexa.com, the fledgling Pornotube.com ranks among the top 200 websites in the world, well above Target.com, BestBuy.com, Earthlink.net, Netflix.com and social networking site Bebo.com. (Non-porn video-sharing sites Revver.com and Grouper.com, by comparison, are positioned somewhere between 2,500th and 3,000th.)

Xtube.com, ranked somewhere around 500th, according to Alexa, and steadily climbing since the summer, is another user-generated sex site that's following in YouTube's footsteps. Though not as popular, YouTubeBabes.net, which collects sexually explicit content culled from a variety of sites, arrived around the same time. And last month, the X-rated Shufuni.com also launched with an upload YouTube-like model.

The major sites are currently running in Beta test mode, and while they all feature adult warnings and RTA ("Restricted to Adults") labels, only Xtube requires a member login. And even then, no credit card information is requested – simply a check box indicating users are over 18-years-old.

While these sites appeal to the most voyeuristic of (male) desires, web-watchers who think legit sites don't also appeal to lascivious minds are grossly mistaken. Google Video's top four clips on Tuesday were "Girls having fun on webcam," "Sex Accident," "Sexy webcam commercial," and "Cheerleader accident," while YouTube's top-viewed videos often feature some sort of young girl in a scantily clad outfit.

While LonelyGirl15 offers PG-rated confessions and new rising YouTube star Mia Rose (not to be confused with the pornstar of the same name) merely sings for the camera, these videos, with young attractive women performing and relating to the viewer in an intimate way, echo the look of online sex-chat rooms. While Bree and Mia may not be stripping or riding a monkey rocker, they are, to quote Britney (newly X-rated) Spears, "not that innocent," either.