A well-known New York City radio personality is accused of attempting to transport a 7-year-old girl from New Jersey to the Virgin Islands to have sex with her, according to federal prosecutors.

Dave Herman, 77, who hosted "The Dave Herman Rock and Roll Morning Show" for 27 years, allegedly had been communicating online for several months with an undercover law enforcement officer posing as the mother of a young girl.

In one conversation, he allegedly asked the undercover if she was sexually active with her daughter or was interested in people who had sex with children.

He allegedly said "age 6 is the perfect time to start her being loved that way," and discussed how he was attracted to the innocence of young children.

The pair continued communicating, with Herman allegedly trying to set up a meeting with the woman and her daughter.

He allegedly suggested last month that they fly to his vacation home in St. Croix, and that he would pay for it. He then bought plane tickets for them to travel there on Thursday, continuing to "discuss his plan to engage in sexual activity" with the girl, prosecutors said.

Herman was arrested at the airport in St. Croix, where he was set to have a court appearance. Lawyer information was not immediately available.

--Andrew Siff contributed to this story