Dateline NBC has been running "To catch a predator" recently.
They set up hidden cameras in rented homes and lure men to the homes from chatrooms on the internet.
Every one of these guys that show up thinks they are meeting an underage (13 to 15 years old typically) girl.
http://www.msnbc.msn.com/id/10912603/
It's like putting a barrell of raw meat into a pen full of tigers. I'm sure they could sit there and do this for years. Jails would be over-run with these guys.
It gives you the feeling that this is an epidemic.
Shocking as well are the kinds of men that show up. Teachers, ministers, professionals, etc.. Nobody seems to be exempt from taking these huge risks.