Police dropped six charges today in exchange for the guilty pleas, which included a new charge that between January 1 this year and May 24, Greer "did enter into a dealing'' with two girls under the age of 18 for the purpose of sexual exploitation.
He also admitted supplying cannabis, and three charges of possessing cannabis and the Class B controlled drugs morphine, and Ritalin.
Police prosecutor Sergeant Chris Scott said Greer's digital camera was found with 17 photographs of six different females in "various stages of undress exposing their genitals or breasts''.
Only two of the victims have been identified, with the ages of the others unknown, Mr Scott said.
Text data recovered form Greer's cellphone established he had sold cannabis to 20 "school-age students''.