Along with marketed content for the PlayStation Portable, Nicolakis said Playboy started a service called iBod. The service started in 2005 and allows users to download soft porn to their device.
Wallpaper of nude photos and explicit ring tones are some of the other materials available through built-in Web browsers in portable devices like the iPhone, Nicolakis said, and parental safeguards are nonexistent or just now becoming available.
He said another avenue for pornographic material is user-generated photos or videos sent from cell phone to cell phone.
Teens are reportedly taking sexually explicit photos of themselves and sending them to friends, but the images can easily be sent without consent to others, Nicolakis said.
"That's child pornography, and that's a felony," he said. "If you think you're immune to it here in Modesto, you're wrong. It's probably already happened, you just don't know yet.