John Eastman, 45, is accused of using videocall service Skype to contact youngsters while pretending to be the heart-throb singer, reported Daily Star.
It is alleged Eastman adopted the name "Harry.Styles888" and used photos of the One Direction star to convince girls as young as five that he was the pop singer, before offering them tickets to the band's concerts if they would strip on camera.
He was arrested in Connecticut, US and was arraigned on charges including employing a minor in an obscene performance. He is being held on a 322,000 pounds bond.