HARRISBURG -- An aide to a McCandless state senator known for her tough stance on sex crimes was arrested late Thursday on accusations he propositioned a 15-year-old over the Internet.

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Investigators believe Mr. Berlin and the boy met on an Internet site for "furries," an online community of people who adopt half-animal, half-human personas.

In one message, according to the complaint, Mr. Berlin requested pictures of the boy and wrote, "When will your folks be out?"

Other messages describe various sex acts in explicit detail and refer to "yiffing," which is a "furry" term for having sex.

Mr. Berlin used the screen name "alan_panda_bear" in his messages. He also used that name for an online personal ad that depicts cartoonish panda bears, one wearing a diaper.

"I'm a Daddyfur and Caretaker and I am looking for a babyfur to be my mate and my companion in a long-term committed relationship," the ad says. "I am a hopeless romantic and very affectionate, freely giving hugs, scritches, cuddles and kisses."

According to the ad, he wanted someone 20 to 25, who has a car and would call him Daddy.