Police admonished 158 teenagers last year, mostly females, for trying to date for money and selling underwear over the Internet, the National Police Agency said Thursday.

Under the cyberguidance program targeting those under 18, police officers make contact online with minors without revealing their identity and caution them after they meet them in person.

Of the total, 150 were girls, it said. The minors were aged 15.8 on average and the youngest was 13 years old, it said. Seventy-four offered to date for money, 73 were involved in buying and selling of underwear, and three were engaged in both, it said.

The NPA said 82 had been victims of child prostitution and other crimes in the past, while 52 had no such experience or police history.