It’s a maxim of technology: Invent the newest gadget and the porn industry will find a way to cash in.

So when Apple Inc. launched the iPhone 4 and its FaceTime videoconference feature, it didn’t take long for adult entertainment companies to develop video-sex chat services and start hiring workers through Craigslist.

With more than three million of the phones already sold, the adult industry stands to make big money on this new way to reach out and touch someone — even if it puts Apple, which has always taken pains to keep its iPhone apps squeaky clean, in an awkward spot.

For years, cameras mounted on computers have helped connect people for racy online video sessions. But the portability and privacy of a cellphone makes FaceTime a new frontier for the industry.

“A phone is such an intimate thing, you usually don’t lend it out,” said Quentin Boyer, a spokesman for Pink Visual, an adult production company.

He said his company will offer FaceTime sessions with some of the same women who appear in its videos.